1) At 270c, Nitrogen has a volume of 650cm³ under a pressure of 980mmHg.What would be its volume at the same temperature but at a pressure of 760mmHg?
Step I
We know that from the Boyle's law, p1 v1=p2 v2 at constant temperature.

Step II
From the question P1=980mmHg
V1=650cm³
P2=760mmHg
Step III
To calculate for the unknown final volume v2, substitute the value in P1V1=P2V2
Step IV
Make v2 the subject of the formula
v2=p1v1/p2