Question

Will mark as Brainliest.

Answer 1

The answer is going to be A

Answer 2

Where, P is the pressure of the gas, V is volume of the gas and T is the temperature of the gas in Kelvin.
For two situations, we can use that as,P₁V₁/T₁= P₂V₂/T₂
P₁ = 795 mm HgV₁ =  642 mLT₁ = (273 + 23.5) K = 296.5 KP₂ = ? V₂ = 957 mLT₂ = (273 + 31.7) K = 304.7 K
By applying the formula,
795 mm Hg x 642 mL / 296.5 K = P₂ x 957 mL / 304.7 K                                              P₂ = 548.07 mm Hg                                              P₂ = 548 mm Hg760 mmHg = 1 atm548 mm Hg = 1 atm x (548 mmHg / 760 mmHg) = 0.721 atm
Pressure of gas = 548 mm Hg = 0.721 atm