12. How many grams are equal to 3.46 moles of sodium sulfide, Na2S? with work please

Explanation:

To convert from moles to grams, the molar mass must be used.

1. Find Molar Mass

The compound is sodium sulfide: Na₂S

First, find the molar masses of the individual elements in the compound: sodium (Na) and sulfur (S).

There are 2 atoms of sodium, denoted by the subscript after Na. Multiply the molar mass of sodium by 2 and add sulfur's molar mass.

This number tells us the grams of sodium sulfide in 1 mole.

2. Calculate Grams

Use the number as a ratio.

Multiply by the given number of moles, 3.46.

The moles of sodium sulfide will cancel.

3. Round

The original measurement of grams, 3.46, has 3 significant figures. We must round our answer to 3 sig figs.

For the answer we calculated, that is the ones place.

The 0 in the tenth place tells us to leave the 0 in the ones place.

There are about 270 grams of sodium sulfide in 3.46 moles.

Mass = 269.8 g

Explanation:

Given data:

Number of moles of Na₂S = 3.46 mol

Mass of Na₂S = ?

Solution:

Formula:

Mass = number of moles × molar mass

Molar mass of Na₂S = 78.0 g/mol

Mass = 3.46 mol × 78.0 g/mol

Mass = 269.8 g

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