Question

Pt.11. You have four gas samples: OL of Heat STP 2 1OL of Ar at STP OL of He at O'C and 900 mmHg Which sample has the largest number ofgas particles (atoms or molecules clearly show your work and reasoning.

Answer 1

answer : 1 ) 1.0 L of H2 at STP has largest number of gas particles

Explanation

1 and 2)

at STP 1 mol of gas has the 6.023 x 10^23 particles.

so 1.0 L H2 and 1.0 L Ar at STP has same number of gas particles.

3) for 1.0 L H2 at 27 oC and 760 mm Hg

temperature = 300 k

pressure = 1 atm

volume = 1 L

P V = n R T

1 x 1 = n x 0.0821 x 300

n = 0.0406

1 mol -----------> 6.023 x 10^23

0.0406 -------------> 2.445 x 10^22 particles

4)

1.184 x 1 = n x 0.0821 x 273

n = 0.0528

number of gas particles = 3.18 x 10^22 particles.