Practice Quiz 1

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Elnaz Guivatchian 3L
Posts: 11
Joined: Wed Sep 21, 2016 2:55 pm

Practice Quiz 1

Postby Elnaz Guivatchian 3L » Thu Feb 02, 2017 5:25 pm

Hi,
can someone please explain number 11 on the practice quiz.
Thank you

Rachel_Harland_3I
Posts: 19
Joined: Fri Jul 22, 2016 3:00 am

Re: Practice Quiz 1

Postby Rachel_Harland_3I » Thu Feb 02, 2017 5:41 pm

1) find moles of PbO (=.22 mol)
2)multiple the moles by the H of reaction for 1 mole (-106.9) to get -23800J which represents the H for reaction consisting of 49.7g of PbO
3)use q=nCT. -23800=n(4.184)(100-25)
4)solve for n and you get 75.9 grams


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