A volume of 56.0 mL of He at STP. a. How much weight?

Question

asked Sep 16, 2023 145k views

1 Answer

Ciano · Answer 1 · 2023-09-21T01:03:29+0000

We already know that number of moles is 0.0025 mol.

So if we know the volume of the gas at STP and the number of moles we can get the mass of the gas.

V = 0.056 L

1 mol = 22.4 L

Molar mass of He = 4.0026 g/mol

So to calculate the weight we need number of moles and molar mass.

weight = 0.0025 mol x 4.0026 g/mol

= 0.01 g