Question

How many grams are equal to 3.46 moles of sodium sulfide

Answer 1

The equation would be set up as 
78g/mol *3.46mol which would be 22.54 grams

Answer 2

Answer : The mass of $Na_2S$ is, 269.9 grams.

Explanation : Given,

Moles of sodium sulfide = 3.46 mol

Molar mass of sodium sulfide = 78 g/mol

Formula used :

$\text{ Mass of }Na_2S=\text{ Moles of }Na_2S\times \text{ Molar mass of }Na_2S$

Now put all the given values in this formula, we get:

$\text{ Mass of }Na_2S=(3.46moles)\times (78g/mole)=269.9g$

Therefore, the mass of $Na_2S$ is, 269.9 grams.