Chemistry related question

Question

A 1200 mL sample of helium gas is at a pressure of 350 mmH and a temperature of 300 K. What volume will this gas sample occupy if the pressure is increased to 700 mmH and the temperature is increased to 400 K?

(A) 450 mL

(B) 800 mL

(C) 1650 mL

(D) 3200 mL

Answer 1

Apply combined Gas Law equation

P1V1/T1 = P2V2/T2

P1 = 350 mmH

V1 = 1200 mL

T1 = 300 K

P2 = 700 mmH

V2 = ?

T2 = 400 K

Substitute the above values in the equation:

350*1200/300 = 700*v2/400

V2 = 800 mL answer(B)