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Question

18g of steam is passed over 2g of Iron.H2O + Fe H2 + Fe2O3 Which is the excessive reagent? [Fe = 55.85g]


A

H2O

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B

H2

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C

Fe

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D

Fe2O3

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Solution

The correct option is A

H2O


First, balance the given reaction.

3H2O + 2Fe 3H2 + Fe2O3

3 moles of H2O = 2 moles of Fe

3 × 18g = 2 × 55.85g

54g of H2O = 111.7g of Fe

18g of H2O=18×111.754=37.23g of Fe

Iron is the limiting reagent and H2O is in excess


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