Homework Help: What mass of the ethanol is she freezing?

MacoRules94 · Mar 8, 2010

A technician freezes some ethanol by removing 9.53x10^4 J of heat energy from it at its melting point. What mass of the ethanol is she freezing?

rock.freak667 · Mar 8, 2010

Re: help

MacoRules94 said: ↑

A technician freezes some ethanol by removing 9.53x10^4 J of heat energy from it at its melting point. What mass of the ethanol is she freezing?

What equation do you think you need to use here? What information do you think you need to have to work out this problem?

MacoRules94 · Mar 8, 2010

Re: help

No idea

rock.freak667 · Mar 8, 2010

Re: help

MacoRules94 said: ↑

No idea

Wouldn't the technician have to lower the temperature to the freezing point? Do you know an equation that related heat energy to temperature?

MacoRules94 · Mar 8, 2010

Re: help

No ida

rock.freak667 · Mar 8, 2010

Re: help

MacoRules94 said: ↑

No ida

Do you know the equations Q=mcΔT and Q=ml ?

MacoRules94 · Mar 8, 2010

Re: help

Yes

Q = Mas x (umm, 4200 for water :) ) x (Tf - To)

rock.freak667 · Mar 8, 2010

Re: help

You will need to get the specific heat capacity of ethanol, the melting and freezing temperatures. Look those up.