What is the normal body temperture in degrees Celsius?
Q. If the normal body temperture in the Faherheit scale is 98.6 degrees than what is the Celsius temperture?
Asked by cheli - Sun Mar 11 15:49:14 2007 - - 3 Answers - 0 Comments
A. Most people think of a "normal" body temperature as an oral temperature of 98.6 F. This is an average of normal body temperatures. Your temperature may actually be 1 F (0.6 C) or more above or below 98.6 F. Also, your normal body temperature changes by as much as 1 F (0.6 C) throughout the day, depending on how active you are and the time of day. Body temperature is very sensitive to hormone levels and may be higher or lower when a woman is ovulating or having her menstrual period. 37 Celsius
Answered by momus2k7 - Sun Mar 11 16:01:51 2007
Q. If the normal body temperture in the Faherheit scale is 98.6 degrees than what is the Celsius temperture?
Asked by cheli - Sun Mar 11 15:49:14 2007 - - 3 Answers - 0 Comments
A. Most people think of a "normal" body temperature as an oral temperature of 98.6 F. This is an average of normal body temperatures. Your temperature may actually be 1 F (0.6 C) or more above or below 98.6 F. Also, your normal body temperature changes by as much as 1 F (0.6 C) throughout the day, depending on how active you are and the time of day. Body temperature is very sensitive to hormone levels and may be higher or lower when a woman is ovulating or having her menstrual period. 37 Celsius
Answered by momus2k7 - Sun Mar 11 16:01:51 2007
what degrees celsius is good weather to not need a jacket?
Q. It's 24 degrees celsius and I just want to know if I should wear a sweater or not today.
Asked by Rachel Raee - Fri May 22 16:56:10 2009 - - 3 Answers - 0 Comments
A. 24C = 75.2 F = no sweater or Jacket 0 C = freezing = 32 F 10 C = 50 F = maybe sweater , maybe not
Answered by a simple man - Fri May 22 17:32:26 2009
Q. It's 24 degrees celsius and I just want to know if I should wear a sweater or not today.
Asked by Rachel Raee - Fri May 22 16:56:10 2009 - - 3 Answers - 0 Comments
A. 24C = 75.2 F = no sweater or Jacket 0 C = freezing = 32 F 10 C = 50 F = maybe sweater , maybe not
Answered by a simple man - Fri May 22 17:32:26 2009
How do you convert degrees Fahrenheit to degrees Celsius?
Q. LIKE: What is the Celsius of 60 degrees Fahrenheit?
Asked by silvermedal - Sun May 13 10:46:08 2007 - - 5 Answers - 0 Comments
A. You have two good answers above (2 and a half), but I decided to give you one more, to add some useful details. Celsius is based on the freezing and boiling points of water. 0 celsius is the temperature water freezes, and 100 celsius is the temperature at which it boils (at standard pressure). If you are used to the Fahrenheit scale, then you should know these values are 32 and 212 respectively. So 0 C = 32 F, and 100 C = 212 F. Armed with these two data points, you can derive the conversion equations. Remembering that the conversion factor is 9/5 (or 5/9) makes the task even easier--you don't have to find the slope. Clearly the difference between degrees C is greater than the diffence between degrees F. (100-0 < 212-32). … [cont.]
Answered by Natanovich - Sun May 13 11:28:35 2007
Q. LIKE: What is the Celsius of 60 degrees Fahrenheit?
Asked by silvermedal - Sun May 13 10:46:08 2007 - - 5 Answers - 0 Comments
A. You have two good answers above (2 and a half), but I decided to give you one more, to add some useful details. Celsius is based on the freezing and boiling points of water. 0 celsius is the temperature water freezes, and 100 celsius is the temperature at which it boils (at standard pressure). If you are used to the Fahrenheit scale, then you should know these values are 32 and 212 respectively. So 0 C = 32 F, and 100 C = 212 F. Armed with these two data points, you can derive the conversion equations. Remembering that the conversion factor is 9/5 (or 5/9) makes the task even easier--you don't have to find the slope. Clearly the difference between degrees C is greater than the diffence between degrees F. (100-0 < 212-32). … [cont.]
Answered by Natanovich - Sun May 13 11:28:35 2007
What is the solubility-product constant for this salt at 25 degrees celsius?
Q. A 1.00 L solution saturated at 25 degrees celsius with lead (II) iodide contains 0.54 g of PbI2. What is the solubility-product constant for this salt at 25 degrees celsius? Please show how to do it.
Asked by thatonekid - Tue Dec 8 16:45:20 2009 - - 1 Answers - 0 Comments
A. moles PbI2 = 0.54 g / 461.01 g/mol=0.0012 moles Pb2+ = 0.0012 moles I- = 2 x 0.0012 = 0.0024 Ksp = ( 0.0012)(0.0024)^2=6.91 x 10^-9
Answered by Dr.A - Sat Dec 12 08:04:32 2009
Q. A 1.00 L solution saturated at 25 degrees celsius with lead (II) iodide contains 0.54 g of PbI2. What is the solubility-product constant for this salt at 25 degrees celsius? Please show how to do it.
Asked by thatonekid - Tue Dec 8 16:45:20 2009 - - 1 Answers - 0 Comments
A. moles PbI2 = 0.54 g / 461.01 g/mol=0.0012 moles Pb2+ = 0.0012 moles I- = 2 x 0.0012 = 0.0024 Ksp = ( 0.0012)(0.0024)^2=6.91 x 10^-9
Answered by Dr.A - Sat Dec 12 08:04:32 2009
What happens on the molecular level when a sample of liquid water is heated from 50 degrees Celsius to 60 ?
Q. What happens on the molecular level when a sample of liquid water is heated from 50 degrees Celsius to 60 degrees Celsius? Likewise, when the sample is boiled?
Asked by Chelsea - Fri Oct 10 10:41:18 2008 - - 3 Answers - 0 Comments
A. As you add heat (energy) the particles begin to move faster, causing them to stretch the chemical bonds between molecules that holds the liquid together. Adding enough heat to break these bonds allows the energized molecules to escape the liquid, forming water vapor. The molecules of a gas can be as much as 1000 times as far apart as the molecules of a liquid of the same substance.
Answered by Adam W - Fri Oct 10 10:47:41 2008
Q. What happens on the molecular level when a sample of liquid water is heated from 50 degrees Celsius to 60 degrees Celsius? Likewise, when the sample is boiled?
Asked by Chelsea - Fri Oct 10 10:41:18 2008 - - 3 Answers - 0 Comments
A. As you add heat (energy) the particles begin to move faster, causing them to stretch the chemical bonds between molecules that holds the liquid together. Adding enough heat to break these bonds allows the energized molecules to escape the liquid, forming water vapor. The molecules of a gas can be as much as 1000 times as far apart as the molecules of a liquid of the same substance.
Answered by Adam W - Fri Oct 10 10:47:41 2008
What volume of dry air at 1 atm and 25 degrees celsius is required for burning 1L of octane completely?
Q. What volume of dry air at 1.00 atm and 25 degrees celsius is required for burning 1L of octane completely yeilding carbon dioxide and water. the mole fraction of oxygen molecules in dry air is .2095. can you explain how you calculated it?
Asked by James F - Sun Oct 19 21:16:08 2008 - - 1 Answers - 0 Comments
A. A ratio of 13 parts air to 1 part fuel is typical at 1 atmosphere.
Answered by Cap'n C - Sun Oct 19 21:24:41 2008
Q. What volume of dry air at 1.00 atm and 25 degrees celsius is required for burning 1L of octane completely yeilding carbon dioxide and water. the mole fraction of oxygen molecules in dry air is .2095. can you explain how you calculated it?
Asked by James F - Sun Oct 19 21:16:08 2008 - - 1 Answers - 0 Comments
A. A ratio of 13 parts air to 1 part fuel is typical at 1 atmosphere.
Answered by Cap'n C - Sun Oct 19 21:24:41 2008
What is the temperature range on the planet Neptune in degrees Celsius?
Q. The minimum and maximum temperatures on either the surface or the cloud bank. Degrees Celsius if you can. Thanks.
Asked by Laurel B - Sun Apr 19 18:10:57 2009 - - 2 Answers - 0 Comments
A. I'm going to assume you mean what we can see. That is in the clouds: -240 to -353 degrees F Converting from Farhenheit to Celsius 5/9*(x -32) -240F = -151C -353F = -214C
Answered by wache_it@yahoo.com - Tue Apr 21 19:52:11 2009
Q. The minimum and maximum temperatures on either the surface or the cloud bank. Degrees Celsius if you can. Thanks.
Asked by Laurel B - Sun Apr 19 18:10:57 2009 - - 2 Answers - 0 Comments
A. I'm going to assume you mean what we can see. That is in the clouds: -240 to -353 degrees F Converting from Farhenheit to Celsius 5/9*(x -32) -240F = -151C -353F = -214C
Answered by wache_it@yahoo.com - Tue Apr 21 19:52:11 2009
How much heat is needed to convert 35grams of ice at -15 degrees Celsius to steam at 112 degrees Celsius?
Q. How much heat is needed to convert 35grams of ice at -15 degrees Celsius to steam at 112 degrees Celsius?
Asked by Scott S - Wed Jan 30 22:09:36 2008 - - 1 Answers - 0 Comments
A. Easy as 1-2-3 lets do it for 1gram and then multiply the result by 35 at the end. One gram of water requires one calorie of heat per degree Celsius Therefore you need 15 calories ( per gram, as we said) to bring the ice to the melting point. and here is the kicker. The phase change from ice into water at zero degrees takes as much energy as from zero to the boiling point. So, to convert one gram of ice at zero degrees into water at zero degrees required 100 calories! To raise the temperature from zero to one hundert takes another 100 calories ( per gram) At the boiling point (remember the phase change takes a lot of energy!) the same thing again. 1 gram of water at 100 degrees Celsius into steam takes another 100 calories. That is a total… [cont.]
Answered by fathomdiver - Wed Jan 30 23:00:18 2008
Q. How much heat is needed to convert 35grams of ice at -15 degrees Celsius to steam at 112 degrees Celsius?
Asked by Scott S - Wed Jan 30 22:09:36 2008 - - 1 Answers - 0 Comments
A. Easy as 1-2-3 lets do it for 1gram and then multiply the result by 35 at the end. One gram of water requires one calorie of heat per degree Celsius Therefore you need 15 calories ( per gram, as we said) to bring the ice to the melting point. and here is the kicker. The phase change from ice into water at zero degrees takes as much energy as from zero to the boiling point. So, to convert one gram of ice at zero degrees into water at zero degrees required 100 calories! To raise the temperature from zero to one hundert takes another 100 calories ( per gram) At the boiling point (remember the phase change takes a lot of energy!) the same thing again. 1 gram of water at 100 degrees Celsius into steam takes another 100 calories. That is a total… [cont.]
Answered by fathomdiver - Wed Jan 30 23:00:18 2008
What is the final temperature of the gas, in degrees Celsius?
Q. A 2.40 L gas sample at 25 degrees celsius and a pressure of 95.3kPa expands to a volume of 7.00L. The final pressure of the gas is 47.3kPa. Its a really hard Chem problem!
Asked by Sarah - Fri Jul 17 11:00:15 2009 - - 3 Answers - 0 Comments
A. For this type of question use the simplest method - the combined gas equation: P1V1/T1 = P2V2/T2 The only thing to remember is that the temperature must be in K. 95.3*2.40/298 = 47.3*7.00/T2 T2 = 298*47.3*7.00/(95.3*2.40) T2 = 431.4K Temp oin C = 431.4 - 273 = 158.4 C
Answered by Trevor H - Fri Jul 17 14:05:07 2009
Q. A 2.40 L gas sample at 25 degrees celsius and a pressure of 95.3kPa expands to a volume of 7.00L. The final pressure of the gas is 47.3kPa. Its a really hard Chem problem!
Asked by Sarah - Fri Jul 17 11:00:15 2009 - - 3 Answers - 0 Comments
A. For this type of question use the simplest method - the combined gas equation: P1V1/T1 = P2V2/T2 The only thing to remember is that the temperature must be in K. 95.3*2.40/298 = 47.3*7.00/T2 T2 = 298*47.3*7.00/(95.3*2.40) T2 = 431.4K Temp oin C = 431.4 - 273 = 158.4 C
Answered by Trevor H - Fri Jul 17 14:05:07 2009
How long does it take a 750W coffeepot to bring a 0.75 L of water initially at degrees Celsius?
Q. How long does it take a 750W coffeepot to bring a 0.75 L of water initially at degrees Celsius? Assume that the part of the pot which is heated with the water is made of 360 g of aluminum, and that no water boils away. Thank You
Asked by Max - Wed Jul 15 15:27:09 2009 - - 1 Answers - 0 Comments
A. Unfortunately the starting temperature is not specified in your question. We can still solve this problem, however, we'll just call the starting temperature X. STEP 1: Look up specific heats for water and for aluminum. These values can be found in a physics textbook or on the web. Specific heat of water: 4.2 J/gK Specific heat of aluminum: 0.90 J/gK STEP 2: Calculate the specific heat capacity for the given quantity of water, and for the given quantity of aluminum. For the water: 750 ml * 1 g/ml * 4.2 J/gK = 3150 J/K For aluminum: 360 g * 0.90 J/gK = 324 J/K Adding the two together gives us the total heat capacity of 3474 J/K. Thus, to heat the water plus coffeepot 1 degree would take 3474 joules. STEP 3: Calculate the total joules… [cont.]
Answered by SciFiGuy - Wed Jul 15 19:49:09 2009
Q. How long does it take a 750W coffeepot to bring a 0.75 L of water initially at degrees Celsius? Assume that the part of the pot which is heated with the water is made of 360 g of aluminum, and that no water boils away. Thank You
Asked by Max - Wed Jul 15 15:27:09 2009 - - 1 Answers - 0 Comments
A. Unfortunately the starting temperature is not specified in your question. We can still solve this problem, however, we'll just call the starting temperature X. STEP 1: Look up specific heats for water and for aluminum. These values can be found in a physics textbook or on the web. Specific heat of water: 4.2 J/gK Specific heat of aluminum: 0.90 J/gK STEP 2: Calculate the specific heat capacity for the given quantity of water, and for the given quantity of aluminum. For the water: 750 ml * 1 g/ml * 4.2 J/gK = 3150 J/K For aluminum: 360 g * 0.90 J/gK = 324 J/K Adding the two together gives us the total heat capacity of 3474 J/K. Thus, to heat the water plus coffeepot 1 degree would take 3474 joules. STEP 3: Calculate the total joules… [cont.]
Answered by SciFiGuy - Wed Jul 15 19:49:09 2009
How many Joules of heat does it take to heat 1kg of iron from 22 degrees Celsius to its melting temperature?
Q. How many Joules of heat does it take to heat 1kg of iron from 22 degrees Celsius to its melting temperature? also How many Joules of heat does it take to melt 1kg of iron at its melting point?
Asked by senoritamaria25 - Mon Mar 3 16:39:10 2008 - - 1 Answers - 0 Comments
A. The specific heat of Iron is 0.44 J/gmC Melting point of iron is 1535 degrees C 1000gm*(1535-22)C*0.44J/g mC = 665700 Joules
Answered by David M - Mon Mar 3 23:55:04 2008
Q. How many Joules of heat does it take to heat 1kg of iron from 22 degrees Celsius to its melting temperature? also How many Joules of heat does it take to melt 1kg of iron at its melting point?
Asked by senoritamaria25 - Mon Mar 3 16:39:10 2008 - - 1 Answers - 0 Comments
A. The specific heat of Iron is 0.44 J/gmC Melting point of iron is 1535 degrees C 1000gm*(1535-22)C*0.44J/g mC = 665700 Joules
Answered by David M - Mon Mar 3 23:55:04 2008
What pressure would be exerted in a 125-mL flask at 25 degrees celsius?
Q. What pressure would be exerted in a 125-mL flask at 25 degrees celsius by 1.51 moles of CO2?
Asked by Shane F - Mon May 18 23:02:43 2009 - - 1 Answers - 0 Comments
A. p = 1.51 x 0.08206 x 298 K / 0.125 L= 295 atm
Answered by Dr.A - Tue May 19 02:31:44 2009
Q. What pressure would be exerted in a 125-mL flask at 25 degrees celsius by 1.51 moles of CO2?
Asked by Shane F - Mon May 18 23:02:43 2009 - - 1 Answers - 0 Comments
A. p = 1.51 x 0.08206 x 298 K / 0.125 L= 295 atm
Answered by Dr.A - Tue May 19 02:31:44 2009
A gas initially at 10 degrees celsius needs to be changed to how many degrees celsius to triple the pressure?
Q. The answer for sure is not 30 degrees celsius nor is it 0.33 degrees celsius.
Asked by islnd_inthe_sun - Sat Feb 2 00:01:55 2008 - - 2 Answers - 0 Comments
A. 10 C = 283K x 3 = 849K - 273 = 576 C.
Answered by Norrie - Sat Feb 2 00:12:12 2008
Q. The answer for sure is not 30 degrees celsius nor is it 0.33 degrees celsius.
Asked by islnd_inthe_sun - Sat Feb 2 00:01:55 2008 - - 2 Answers - 0 Comments
A. 10 C = 283K x 3 = 849K - 273 = 576 C.
Answered by Norrie - Sat Feb 2 00:12:12 2008
What does the degrees Celsius stand for on power cords? Is it important?
Q. My cat ate my power cable for my PC. I have an old almost identical cable for an older monitor lying around. The specs are exactly the same EXCEPT the one I want to use from my monitor states 60 degrees Celsius and the the older ruined one that I have to throw out says 105 degrees Celsius. Can I use the 60 degree Celsius one? What does that spec stand for? Is is safe if all the other ratings are exactly the same?
Asked by Courtney D - Wed Jun 25 01:24:17 2008 - - 3 Answers - 0 Comments
A. 105 is a higher temperature - enough to boil water. Is the cable going to use a lot of power? I don't think your PC is going to take 3kw of power and make the cable heat up, it should be fine. Try buying a plastic water pipe and use that to protect the cable from your moggy.
Answered by Ben . - Wed Jun 25 01:46:19 2008
Q. My cat ate my power cable for my PC. I have an old almost identical cable for an older monitor lying around. The specs are exactly the same EXCEPT the one I want to use from my monitor states 60 degrees Celsius and the the older ruined one that I have to throw out says 105 degrees Celsius. Can I use the 60 degree Celsius one? What does that spec stand for? Is is safe if all the other ratings are exactly the same?
Asked by Courtney D - Wed Jun 25 01:24:17 2008 - - 3 Answers - 0 Comments
A. 105 is a higher temperature - enough to boil water. Is the cable going to use a lot of power? I don't think your PC is going to take 3kw of power and make the cable heat up, it should be fine. Try buying a plastic water pipe and use that to protect the cable from your moggy.
Answered by Ben . - Wed Jun 25 01:46:19 2008
What is the boiling point of an aqueous solution that has a vapor pressure of 18.0 torr at 25 degrees celsius?
Q. What is the boiling point of an aqueous solution that has a vapor pressure of 18.0 torr at 25 degrees celsius? How do I approach this problem and how do I solve it??
Asked by Jenn M. - Wed Sep 16 12:18:27 2009 - - 1 Answers - 0 Comments
A. vapor pressure pure water at 25 C = 23.76 torr p = p X ( Raoult's law) 18.0 = 23.76 X X = mole fraction water = 0.758 moles water = 0.758 mass water = 0.758 mol x 18.02 g/mol=13.7 g = 0.0137 Kg moles solute = 1.00 - 0.758 =0.242 molality of this solution = 0.242 mol / 0.0137 Kg=17.7 delta T = kb x m = 0.512 x 17.7 =9.0 C boiling point = 100 + 9.0 = 109 C
Answered by Dr.A - Wed Sep 16 12:30:42 2009
Q. What is the boiling point of an aqueous solution that has a vapor pressure of 18.0 torr at 25 degrees celsius? How do I approach this problem and how do I solve it??
Asked by Jenn M. - Wed Sep 16 12:18:27 2009 - - 1 Answers - 0 Comments
A. vapor pressure pure water at 25 C = 23.76 torr p = p X ( Raoult's law) 18.0 = 23.76 X X = mole fraction water = 0.758 moles water = 0.758 mass water = 0.758 mol x 18.02 g/mol=13.7 g = 0.0137 Kg moles solute = 1.00 - 0.758 =0.242 molality of this solution = 0.242 mol / 0.0137 Kg=17.7 delta T = kb x m = 0.512 x 17.7 =9.0 C boiling point = 100 + 9.0 = 109 C
Answered by Dr.A - Wed Sep 16 12:30:42 2009
how many degrees farenheit is one degree celsius?
Q. i don't mean like 0 celsius is 32 farenheit, that kind of conversion thing. what i want to know exactly is this: an article said something (doesnt matter what) will rise in temperature by one degree celsius within a decade and 6 degrees celsius within 20 years. how much is this 1 degree and 6 degrees in farenheit? moonrose and monkies: that is exactly the thing i am NOT looking for.
Asked by audrey - Sun Dec 14 20:32:45 2008 - - 5 Answers - 0 Comments
A. The other answerers are on the correct track, sort of. You do need to perform the conversion from Celcius to Farenheit, but you need to do it twice to find the rate of change. The formula is F = 9/5 C + 32 start with 0C = (9/5) 0 +32 = 32F increase of 1 degree 1C = (9/5) 1 +32 = 32+1 4/5F = 33 4/5 F the change F is 33 4/5 - 32F = 1 4/5 F = 1.8 F if you prefer decimals instead. So, 1 degree C change = 1.8 degrees F change For a 6 degree C change, just multiply 1.8 * 6 = 10.8 degrees F
Answered by Novafury - Tue Dec 16 02:13:26 2008
Q. i don't mean like 0 celsius is 32 farenheit, that kind of conversion thing. what i want to know exactly is this: an article said something (doesnt matter what) will rise in temperature by one degree celsius within a decade and 6 degrees celsius within 20 years. how much is this 1 degree and 6 degrees in farenheit? moonrose and monkies: that is exactly the thing i am NOT looking for.
Asked by audrey - Sun Dec 14 20:32:45 2008 - - 5 Answers - 0 Comments
A. The other answerers are on the correct track, sort of. You do need to perform the conversion from Celcius to Farenheit, but you need to do it twice to find the rate of change. The formula is F = 9/5 C + 32 start with 0C = (9/5) 0 +32 = 32F increase of 1 degree 1C = (9/5) 1 +32 = 32+1 4/5F = 33 4/5 F the change F is 33 4/5 - 32F = 1 4/5 F = 1.8 F if you prefer decimals instead. So, 1 degree C change = 1.8 degrees F change For a 6 degree C change, just multiply 1.8 * 6 = 10.8 degrees F
Answered by Novafury - Tue Dec 16 02:13:26 2008
What does water do besides freezing at 0 degrees celsius.?
Q. I need help with science homework and the question is water both ___ and ___ at 0 degrees celsius therefore, 0 degrees celsius is called ___ point of water. I know the first blank is freezing can you help me out with the others.
Asked by soccrchky - Mon Mar 10 21:37:30 2008 - - 2 Answers - 0 Comments
A. Technically, it freezes AND melts. I cant help you on the second blank though. Good luck!
Answered by God of the Godless - Mon Mar 10 21:44:59 2008
Q. I need help with science homework and the question is water both ___ and ___ at 0 degrees celsius therefore, 0 degrees celsius is called ___ point of water. I know the first blank is freezing can you help me out with the others.
Asked by soccrchky - Mon Mar 10 21:37:30 2008 - - 2 Answers - 0 Comments
A. Technically, it freezes AND melts. I cant help you on the second blank though. Good luck!
Answered by God of the Godless - Mon Mar 10 21:44:59 2008
What volume does 290g (5mol) of butane (C4H10) occupy at 758 torr and 40 degrees Celsius?
Q. I am not sure if this is relevant, but the normal boiling point of butane is -0.5 degrees Celsius. Also, I would really appreciate an explanation as to how and why you got the answer you did so that I can actually come to understand the question myself. Thanks!
Asked by Jill - Fri Jan 29 13:20:28 2010 - - 1 Answers - 0 Comments
Q. I am not sure if this is relevant, but the normal boiling point of butane is -0.5 degrees Celsius. Also, I would really appreciate an explanation as to how and why you got the answer you did so that I can actually come to understand the question myself. Thanks!
Asked by Jill - Fri Jan 29 13:20:28 2010 - - 1 Answers - 0 Comments
Nickel metal melts at 1455 degrees celsius. How much heat energy is required to change 150 grams of solid ?
Q. Nickel metal melts at 1455 degrees celsius. How much heat energy is required to change 150 grams of solid nickel into liquid nickel at that temperature? Please Help!!!
Asked by Jazz - Mon Oct 27 23:56:20 2008 - - 3 Answers - 0 Comments
A. assuming the nickel is at 1455 C and then melts... H = mass x Hfus Hfus = 17.5 kJ/mole x (1 mole / 58.7 g) = 0.298 kJ/g H = 150g x 0.298 kJ/g = 44.7 kJ
Answered by m w - Thu Oct 30 01:24:26 2008
Q. Nickel metal melts at 1455 degrees celsius. How much heat energy is required to change 150 grams of solid nickel into liquid nickel at that temperature? Please Help!!!
Asked by Jazz - Mon Oct 27 23:56:20 2008 - - 3 Answers - 0 Comments
A. assuming the nickel is at 1455 C and then melts... H = mass x Hfus Hfus = 17.5 kJ/mole x (1 mole / 58.7 g) = 0.298 kJ/g H = 150g x 0.298 kJ/g = 44.7 kJ
Answered by m w - Thu Oct 30 01:24:26 2008
Sound propagating through air at 30 degrees celsius passes through a vertical cold front into air that is -?
Q. 4 degrees celsius. If the sound has a frequency of 2400hz, by what percentage does its wavelength change in crossing the boundary?
Asked by jjames4611 - Wed Aug 15 23:16:37 2007 - - 1 Answers - 0 Comments
A. Wavelength = speed/frequency Since the frequency of the sound will not change, the wavelength change will depend only on the change in the speed of sound. The speed of sound is given by: c = sqrt(gamma*k*T/m) (where gamma is the adiabatic gas constant, k is Boltzmann's constant, T is absolute temperature (Kelvin), m = average molecular mass). For our atmosphere, this can be approximated as: 331.3 + (0.606)*T-c (see reference) - So at 30 degrees C it will be: 349.48 m/s - And at -4 degrees C it will be: 328.88 m/s Therefore, the percentage change in the wavelength is the percentage change in the speed of sound, which is: 100* [(328.88 - 349.48) / (349.48)] = -5.89%
Answered by nealjking - Thu Aug 16 05:09:10 2007
Q. 4 degrees celsius. If the sound has a frequency of 2400hz, by what percentage does its wavelength change in crossing the boundary?
Asked by jjames4611 - Wed Aug 15 23:16:37 2007 - - 1 Answers - 0 Comments
A. Wavelength = speed/frequency Since the frequency of the sound will not change, the wavelength change will depend only on the change in the speed of sound. The speed of sound is given by: c = sqrt(gamma*k*T/m) (where gamma is the adiabatic gas constant, k is Boltzmann's constant, T is absolute temperature (Kelvin), m = average molecular mass). For our atmosphere, this can be approximated as: 331.3 + (0.606)*T-c (see reference) - So at 30 degrees C it will be: 349.48 m/s - And at -4 degrees C it will be: 328.88 m/s Therefore, the percentage change in the wavelength is the percentage change in the speed of sound, which is: 100* [(328.88 - 349.48) / (349.48)] = -5.89%
Answered by nealjking - Thu Aug 16 05:09:10 2007
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