Answers followed by are obtained by using 22-32 litres as two volumes, and 00367 as the coefficient of expansion of a gas. ? after answers means nearly.

1. 19.59 grams.
3. 408.3

grams.

5. 64 grams.

7. 20.4 grams.

2. 14 litres.

4. (a) 1.716 lit. (B) 2.574 lit.

6. 116.51 grams.

8. 5.185 litres.

24. (a) 0.089568 gram. (8) 0.0895917 gram. (7) 0·090086 gram.

21. Oxygen 23 per cent. by mass, 20-72 per cent. by vol.

Nitrogen 77 per cent. by mass, 79-28 per cent. by vol.