Homework Help: physics

Posted by Angel on Wednesday, January 25, 2012 at 8:31pm.

The specific heat of mercury is .03cal/g*C, and it's boiling point is 357*C. The specific heat of water is 1 cal/g*C. It takes 65 calories of energy to vaporize one gram of mercury and 540 calories to vaporize one gram of water. If both substances begin at about 22*C does it take more energy to boil a gram of mercury or a gram of water? If someone can give me the formula to use, I can try to figure it out myself! Thanks

physics - bobpursley, Wednesday, January 25, 2012 at 8:36pm
heat to boil 1 gram water:
mcdeltaT+ Lv*m
1*1*(100-22)+540*1

heat to boil 1 gram Hg
mcdeltatT+Lv*m
1*.03(357-22)+65*1

do the math.
physics - drwls, Wednesday, January 25, 2012 at 8:41pm
Energy required per gram =
Q = (heat of vaporization) + (Tboiling - Tinitial)*(specific heat)

Compute and compare that quantity for both liquids.

For mercury,

Q = 65 + 335*0.03

For water

Q = 540 + 78*1.0

Water's heat requirement is much higher

Answer this Question

Related Questions

Chemistry - CFCs, or chlorofluorocarbons,were once used as refrigerants, but ...
Physics - Find the heat necessary to change 2.5kg of water (ice) at -2 degrees C...
ocean county college - A 150 g sample of metal at 55.0 C raises the temperature ...
Physics - How much heat is required to melt 50 g of mercury at -45 degrees ...
Physics - How much heat is required to melt 50 g of mercury at -45 degrees ...
Physics - How much heat is required to melt 50 g of mercury at -45 degrees ...
chemistry - the heat of fusion water is335 J/g. The heat of evaporization of ...
chemistry - The freezing point of mercury is -38.8°C, is the only metal that...
Chemistry - The freezing point of mercury is -38.8°C, is the only metal that...
Chemistry - The freezing point of mercury is -38.8°C, is the only metal that...

For Further Reading

First Name:
School Subject:
Answer: