Question

When 2.0 mol H2O react with 2.0 mol Fe in the reaction below, 1.5 mol of Fe are used up in the reaction. How many moles of Fe are left over unreacted?

3 Fe + 4 H2O → Fe3O4 + 4H2

3.5 mol Fe left over
1.5 mol Fe left over
1.0 mol Fe left over
0.5 mol Fe left over

Answer 1

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Answer 2

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Answer 3

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Answer 4

you started with 2 moles of iron 1.5 moles are used up so 2-1.5=0.5 moles are left over