Q.

When a sample of baking soda is strongly ignited in a crucible, it suffered a loss in weight of 6.2 gm . The mass of baking soda is

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a

16.8 g

b

8.4 g

c

11.6 g

d

4.2 g

answer is A.

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Detailed Solution

2NaHCO3→Na2CO3+CO2↑+H2O↑ (44+18)= 62 gm loss from → 2×84 gm NaHCO3 6.2 gm loss from → ?=2×8462×6.2  =2×8.4=16.8 gm
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When a sample of baking soda is strongly ignited in a crucible, it suffered a loss in weight of 6.2 gm . The mass of baking soda is