Question

A sample of argon gas at STP occupies 56.2 litres
Determine the number of moles of argon and the made of argon in the sample ( mol wt of Ar=40 )​

Answer 1

Answer:

we can use the ideal gas law equation to find the number of moles;

PV = nRT

where P - pressure

V - volume - 56.2 x 10⁻³ m³

n - number of moles

R - universal gas constant - 8.314 Jmol⁻¹K⁻¹

T - temperature

standard temperature is 273 K

and standard pressure - 101 325 Pa

we can rearrange the equation to find the number of moles

n = {PV}/{RT}n=

RT

PV

substituting the values in the equation

n = {101325Pa*56.2 x 10⁻³ m³}/{8.314 Jmol⁻¹K⁻¹*273K}n=

8.314Jmol⁻¹K⁻¹∗273K

101325Pa∗56.2x10⁻³m³

n = 2.51 mol

molar mass of Ar - 40 g/mol

mass of Ar in the sample - 2.51 mol x 40 g/mol = 100.4 g

hope it helps

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