Question

how much should the pressure be increased in order to decrease the volume of the gas by 5 degrees at a constant temperature

Answer 1

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Ideal gas equation (PV=nRT),

as temperature remains constant we can apply Boyle’s Law, 
the law can be usefully expressed as P₁V₁ = P₂V₂.

V₂ =0.95 V₁ (as V₂ is 5% less than V₁)

P₁×V₁ = P₂×V₂

P₁×V₁ = P₂ (0.95×V₁)

P₂ = P₁/ 0.95

P₂ = 1.052 P₁

%increase in pressure= P2-P1/P1*100

%increase in pressure=1.052P1-P1/P1*100

%increase in pressure = 5.2