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Question

How many grams of sodium carbonate is obtained on heating 8.4 g of NaHCO3(s)?

A
2.1 g
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B
5.3 g
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C
4.2 g
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D
4.6 g
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Solution

The correct option is B 5.3 g
2NaHCO3HeatNa2CO3+CO2+H2O
Given mass of NaHCO3 = 42 g
Molar mass of NaHCO3 = 84 g
Number of moles of NaHCO3 = 8.484=0.1 moles
2 moles of NaHCO3 gives 1 mole of Na2CO3 on heating.
Number of moles of Na2CO3 produced on heating 0.1 moles of NaHCO3 = 0.12=0.05 mol
Mass of Na2CO3 produced
=Number of moles of Na2CO3 produced× Molar mass of Na2CO3
= 0.05 moles×106 g mol1
= 5.3 g

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