# chemistry

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Use the following reaction to answer the questions

4Fe(s) + 3O2(g) ® 2Fe2O3(g) ÄH = -1700 kJ

How many kJ are released when 2.00 g Fe react?
How many grams of rust form when 453 kJ of energy are released?

• chemistry -

Do these as a proportion..

2gramsFe/4molesFe=Energy/-1700kj

of course, convert the 4 moles to grams.

gramsrust/2molesFe2O3=-453/-1700

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