Posted by **john** on Tuesday, October 4, 2011 at 3:56pm.

Ethanol (C2H5OH) boils at a temperature of 78.3oC.

What amount of energy, in joules, is necessary to heat to boiling and then completely vaporize a 20.0 g sample of ethanol initially at a temperature of 13.6oC.

The specific heat of ethanol is approximately constant at 2.44 JK-1g-1

The heat of vaporization of ethanol is 38.56 kJ mol-1.

- college chem -
**bobpursley**, Tuesday, October 4, 2011 at 4:21pm
energy= mass*Lf+ mass*c*deltaTemp

look at the units of the constants.

Hv is in kJ per mole.

energy= moles*Lf+mass*c*deltaTEmp

now, for the first term, convert 20g ethanol to moles ethanol, and you have it.

- physical science -
**carolyn**, Thursday, October 6, 2011 at 3:13pm
a player uses a hockey stick to increase the speed of a 0.200kg hockey puck by 6 m/s in 2 seconds how much did the hockey puck accelerate

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