Question

HOW MANY GRAMS ARE in 3.3 moles of potassium sulfide, k2s

Answer 1

n=weight/Gmm

gmm of k2s is 110.262 g/mol

3.3×110.262=weight

weight=363.8646 g

Answer 2

Given:

• 3.3 moles of potassium sulphide is provided.

To find:

• Mass of the sample ?

Calculation:

First of all, we must know :

• Molecular formula of potassium sulphide is $(K_{2}S)$.

• Atomic mass of K is 39 g/mol and that of S is 32 g/mol.

• The molar mass of potassium sulphide $(K_{2}S)$ is (39×2 + 32) = 110 g/mol.

Now, mass of sample is :

$m = molar \: mass \times moles$

$\implies \: m = 110 \times 3.3$

$\implies \: m =363 \: g$

So, mass of sample is 363 grams.