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Chemistry Homework Help => General Chemistry => Topic started by: rsamuel on March 10, 2012, 09:27:11 AM

Title: Help Thermochemistry ASAP please!
Post by: rsamuel on March 10, 2012, 09:27:11 AM
What mass of ammonium nitrate is required to lower the temperature of 400 mL of water from 25oC to 1oC? The Hsoln for ammonium nitrate = 34 kJ/mol.

This is what  I have. x/80.052(34KJ/mol)=-(400+x)(4.18J/g℃)(-24℃)
Can't seem to find an answer.

Thanks
Title: Re: Help Thermochemistry ASAP please!
Post by: uma on March 10, 2012, 10:21:45 AM
It should be
x = mass of ammonium nitrate , molar mass of ammonium nitrate=53.4917 g/mol
x X 34KJ/mol / 53.4917 g/mol = (400+x)(4.18J/g℃)(24℃)
Now solve it for x
Title: Re: Help Thermochemistry ASAP please!
Post by: rsamuel on March 10, 2012, 10:34:16 AM
Having an issue solving for X. May you show me how please.
Thanks
Title: Re: Help Thermochemistry ASAP please!
Post by: uma on March 17, 2012, 09:41:57 PM
Its mathematics pl try your self 
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