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 JK1g1
The heat of vaporization of ethanol is 38.56 kJ mol1.

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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