Question

At 25° C, and 860 mm Hg pressure volume of a gas is
900 ml. When volume of a gas is 940 ml and
temperature is 20°C then What is the pressure of the
gas at this altitude?
(A)
676.6 mm Hg
(B)
809.59 mm Hg
(C)
809.69 mm Hg
(D)
676.6 mm Hg​

Answer 1

Answer:

B) 809.59 mm Hg

Explanation:

25℃ = 298K , 20℃ = 293 K

Using combined gas law

$\frac{p1v1}{t1} = \frac{p2v2}{t2}$

we get

860 × 0.9/ 298 = p2 × 0.94 / 293

==> p2 = (860 × 0.9×293) / (298×0.94)

==> p2 = 809.59 mm Hg