You have a 5-liter container with 2.00 x 1023 molecules of ammonia gas (NH3) at STP

How many molecules of argon gas (Ar) are in an identical container at the same temperature

and pressure?

6.02 x 1024 molecules

1.30 x 1024 molecules

2.00 x 1023 molecules

6.02 1023 molecules

1.34*10²³ molecules

Explanation:

Given dа ta:

Volume of container = 5 L

Number of molecules of ammonia = 2.00*10²³

Number of molecules of Ar = ?

Volume of container = 5 L

Temperature = 273 K

Pressure = 1 atm

Solution:

PV = nRT

n = PV/RT

n = 1 atm. 5 L / 0.0821 atm. L. mol⁻¹. K⁻¹. 273.15 K

n = 5 L. atm / 22.426 atm. L. mol⁻¹.

n = 0.223 mol

Number of molecules of argon:

One mole = 6.02 * 10²³ molecules

0.223 mol

6.02 * 10²³*0.223

1.34*10²³ molecules