Given the following equation: 4 Fe + 3022 Fe2O3 What mass of iron is needed to react with 12 grams of oxygen gas? *

Answer : The mass of iron needed is 29.5 grams.

Explanation : Given,

Mass of = 12 g

Molar mass of = 32 g/mol

First we have to calculate the moles of .

Now we have to calculate the moles of

The balanced chemical equation is:

From the reaction, we conclude that

As, 3 moles of react with 4 moles of

So, 0.375 mole of react with mole of

Now we have to calculate the mass of

Molar mass of = 59 g/mole

Therefore, the mass of iron needed is 29.5 grams.

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