Question

A certain mass of a gas occupies 39ml at 760 mm pressure. what volume would it occupy if the pressure is raised to 780 mm provided the temperature remain constant

Answer 1

760×39=780×x
x=38
The answer is 38

Answer 2

Given V1 = 1 litre

P1 = 1 atm

V2 = ?  

P2 = 750 / 760 atm

Using

P1V1 = P2V2

We get

1 × 1 = 750 / 760 × V2

V2 = 1.0133 litre = 1013.3 ml