In which of the four substances,will be there
1)increase in weight,
2)decrease in weight,
3)no change in weight when exposed to air?
*(sodium chioride,sodium carbonate crystals,suiphuric acid and iron)

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Solution

$a . I n c r e a s e i n w e i g h t i s d u e t o i r o n 4 F e + 3 O_{2} \to 2 F e_{2} O_{3} b . D e c r e s e i n w e i g h t N a_{2} C O_{3} \to N a_{2} O + C O_{2} c . N o c h a n g e i n m a s s N a C l, H_{2} S O_{4}$

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Similar questions

In which of the following substances will there be :

(a) increase in mass

(b) decrease in mass

1. Sodium chloride

2. Iron

3. Conc. sulphuric acid

4. Table salt

5. Sodium carbonate crystals

The equations given below relate to the manufacture of sodium carbonate (molecular weight of Na₂CO₃ = 106).

Questions based on the production of 21.2 g of sodium carbonate.

What mass of sodium hydrogen carbonate must be heated to give 21.2 g of sodium carbonate (Molecular weight of NaHC0₃ = 84)?

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