Question

Calculate the volume occupied at s.t.p. if the gas occupies 360 cm3 at 87o
C at 380 mm Hg pressure
please show explanation/ working

Answer 1

Answer:

Molar gas volume at STP = 22400cm³

v1= 360 cm³

p1=380mmHg

t1 = 87+273 = 360K

v2=?

p2 = 760mmHg

t2 = 273K

(p1v1)t1 = (p2v2)/t2

(380x360)/360 = (760xv2)/273

                    v2 = (380 x 273)/760

                    v2 = 136.5 cm³

If 136.5cm³ has a mass of 0.546g

∴ 22400cm³ = (22400x0.546)/136.5 = 89.6g

Note: 22400 is the volume of one mole of gas at STP

∴ Relative molecular mass of the gas = 89.6