Question

at certain pressure and at 17 C temperature the fixed amount of a gas has volume of 0.73L . without change in pressure at what temperature the volume of gas will be 0.85L

Answer 1

You can find temperature by using next law:

(P₁V₁)/T₁ = (P₂V₂)/T₂

P₁ = const ( without change in pressure )
V₁ = 0.73 L
T₁ = 17 C
V₂ = 0.85 L
T₂ - ?

If there is no change in pressure
V₁/T₁ = V₂/T₂

T₂ = 0.85 / (0.73/17)

T₂ = 19.81 C