Consider the following reaction. Another Chemistry problem. Please help :(?

Question

Consider the following reaction: 
[ 2 	ext{Fe}_2	ext{O}_3 = 4 	ext{Fe} + 3 	ext{O}_2 ]
The change in heat for this reaction is +824.2 kJ. If 52.0 g of Fe is formed as a result of this reaction, what is the heat change associated with that amount of iron? 
A) the absorption of 10,700 kJ of heat.
B) the release of 192 kJ of heat.
C) the absorption of 192 kJ of heat.
D) the absorption of 767 kJ of heat.
E) the release of 767 kJ of heat.
F) the release of 10,700 kJ of heat.  
I would appreciate any assistance with this problem. Thank you in advance!

Anonymous · Accepted Answer

C.

A positive change of heat means it’s endothermic, so it absorbs heat.

The change in heat given is PER MOLE:
824.2jk/mol

You have 4 moles of Fe, so:
824.2kJ/4 mol = 206.05 kJ/mol

You’re given 52.0 g Fe. Convert this to moles:
52.0g * 1mol/55.8g = .932 mol Fe

So now you know you have .932 mol Fe to start with. Since the change in heat of Fe is 206.05 kJ/mol, then:

4 mol * 206.05 kJ/mol = 192 kJ

Anonymous · Answer

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Anonymous · Answer

C

Zella Bode

Consider the following reaction. Another Chemistry problem. Please help :(?

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