Amount of Heat required to heat up gases

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Laura Gu 2K
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Joined: Fri Sep 26, 2014 2:02 pm

Amount of Heat required to heat up gases

Postby Laura Gu 2K » Fri Mar 06, 2015 11:44 am

For question 1B on the 2010 final exam, could someone explain why it takes more heat to heat up 1 mole of butane gas than it does to heat up 1 mole of h2 gas from 10 to 20 degrees celsius? Also could someone explain the second part of question 1B?

martha-1I
Posts: 76
Joined: Fri Sep 26, 2014 2:02 pm

Re: Amount of Heat required to heat up gases

Postby martha-1I » Fri Mar 06, 2015 4:05 pm

It takes more heat to heat up one mole of butane gas than one mole of H2 gas because butane has more atoms (C4H10) and therefore requires more heat to be heated up.

martha-1I
Posts: 76
Joined: Fri Sep 26, 2014 2:02 pm

Re: Amount of Heat required to heat up gases

Postby martha-1I » Fri Mar 06, 2015 4:18 pm

For the second part of 1B, it is comparing a covalent bond( C-C is covalent because it shares its electrons) and a phase change ( such as melting ice which is solid ->liquid). Breaking a covalent bond would require more heat because you would need to break the chemical bond. A phase change does require a significant amount of heat in order to occur but it doesn't need to break any chemical bonds in the process so therefore it requires less heat than is needed to break a C-C bond.


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