Calculate the mass, volume and number of molecules for 0.3 mol of phosphine.

Phosphine – phosphorus hydride – PH3

Given:

n (PH3) = 0.3 mol

To find:

m (PH3) -?

V (PH3) -?

N (PH3) -?

Solution:

1. Let’s find the mass by the formula:

m (PH3) = n * M = 0.3 mol * (31 + 1 * 3) = 10.2 g

2. Let’s calculate the volume by the formula:

V (PH3) = Vm * n = 22.4 L / mol * 0.3 mol = 6.72 L

3. Let’s find the number of molecules by the formula:

N (PH3) = NA * n = 6.02 * 10 ^ 23 molecules * 0.3 mol = 1.806 * 10 ^ 23 molecules