Homework L7

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April Meza 3K
Posts: 66
Joined: Sat Sep 21, 2019 12:36 am

Homework L7

Postby April Meza 3K » Thu Oct 10, 2019 11:16 pm

The camel stores the fat tristearin, C 57 H 110 O 6, in its hump. As
well as being a source of energy, the fat is also a source of water
because, when it is used, the reaction 2 C57H110O6(s) +
163 O2(g)---> S 114 CO2(g) + 110 H2O(l) takes place. (a) What
mass of water is available from 1.00 pound (454 g) of this fat? (b)
What mass of oxygen is needed to oxidize this amount of tristearin?

Can someone explain how I would approach this question? Please and thanks!

William Francis 2E
Posts: 101
Joined: Wed Sep 18, 2019 12:20 am

Re: Homework L7

Postby William Francis 2E » Thu Oct 10, 2019 11:52 pm

To start, you need to convert grams of C57H110O6 to moles. The molar mass of this fat is (57 times the molar mass of Carbon) + (110 times the molar mass of Hydrogen) + (6 times the molar mass of oxygen). Once converted to moles, you can multiply this number by 55 to convert it to moles of water since there is a 1:55 ratio of C57H110O6 to H2O in the equation given. Then, you can convert moles of water into grams of water to complete part a of the problem. Let me know if that helps! The process for part b should be similar.

Jedrick Zablan 3L
Posts: 68
Joined: Sat Aug 17, 2019 12:17 am

Re: Homework L7

Postby Jedrick Zablan 3L » Thu Oct 10, 2019 11:52 pm

You would approach both part a and b the same way you would approach others problems in the L section.

1)Divided by the molar mass of the molecule that is given (C57 H110 O6)
2)Multiply by (moles of the mole it is asking for divided by moles of the molecule that is given)
3)Multiply by the molar mass of the molecule it is asking for (Water and Oxygen)

Alexa Hernandez 3k
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Joined: Sat Sep 14, 2019 12:16 am
Been upvoted: 1 time

Re: Homework L7

Postby Alexa Hernandez 3k » Fri Oct 11, 2019 12:00 am

Turn the mass I’m that is given into moles by dividing by the molar mass of the molecule it is asking.

Use a molar ratio to go from the first molecule to the desired one

Multiply that molecule by its molar mass in order to cancel out the moles and get just the mass!!!

April Meza 3K
Posts: 66
Joined: Sat Sep 21, 2019 12:36 am

Re: Homework L7

Postby April Meza 3K » Fri Oct 11, 2019 12:11 am

Thank you, these are really helpful!


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