Question

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Answer 1

a) It's called Vapour Density

b) 2C2H2 + 5O2 → 4CO2 + 2H2O

2 volume       4 volume

1 volume 2 volume

According to Gay Lussac's law : 

2 volume of CO2 is produced from 1 vol. of C2H2 

8. 4 dm3 of CO2 at S.T.P. produced from

= (1 x 8.4)/2

= 4.2 dm3 of C2H2

At S.T.P. 4.2 dm3 of ethyne is required.