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Question

18 g of steam is passed over 2 g of iron.H2O + Fe H2 + Fe2O3. is the excessive reagent? [Fe = 56 g]

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 mol of H2O require 2 mol of Fe
The ratio of moles of water to iron is 32. If the actual ratio is lower than this, that means that there is a lower amount of water, making iron the excess reagent. If this is higher than 1.5, then water is the excess reagent. Let's calculate!
Moles of water = 18 g36 g/mol=0.5mol
Moles of iron = 2 g56 g/mol=0.036mol
Ratio - 0.50.036=13.88
The ratio is much higher than 1.5, making water the excess reagent.


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