Question

How many grams of of K2S are are required to make 628 mL of a 0.525 M K2S solution? The molar mass of K2S is 110.26 g/mol.

Answer 1

To find the mass of K2S, we are given:

0.628 L

0.525M

110.26g/mol

By using the molarity formula:

M = n/v

We can find the number of moles present in this solution

0.525 = n/0.628L

n = 0.33 moles of K2S

Now we will find the mass by using the number of moles and molar mass:

110.26 g = 1 mol

x grams = 0.33 moles

x = 36.38 grams of K2S