Question #a2174

1 Answer
Jun 2, 2017

n = 2.28 "mol"

Explanation:

First, we need to find the mass of argon.

This can be done using the formula rho = frac(m)(V); where rho is the density, m is the mass, and V is the volume of the substance:

Rightarrow rho = frac(m)(V)

Rightarrow m = rho cdot V

The density of argon 1.784 "g L"^(- 1):

Rightarrow m = (1.784 "g L"^(- 1)) cdot (51.0) "L"

Rightarrow m = 90.984 "g"

Then, let's use the formula n = frac(m)(M); where n is the number of moles, m is the mass, and M is the molar mass of the substance:

Rightarrow n = frac(m)(M)

The molar mass of argon is 39.948 "g mol"^(- 1)

Rightarrow n = frac(90.984 " g")(39.948 " g mol"^(- 1))

Rightarrow n approx 2.28 "mol"