Question

What is the mass in grams of a 2.10 mol sample of lithium nitride, Li3n? Show all your work.

Answer 1

Answer:

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Answer 2

Li3N will be 70 grams in mass.

Given:

Number of moles of Li3N = 2.01 moles

To Find:

Mass of Li3N in grams

Solution:

We can easily find the mass of Li3N as shown below.

We know that,

Number of moles of a substance = $\frac{Mass of the substance}{Molar mass}$

Firstly, we need to find the molecular mass of Lithium nitride,

We know that Lithium nitride is made up of 3 Lithium atoms and 1 Nitrogen atom

That is,

Lithium nitride is chemically Li3N

We have,

The molar mass of,

Li = 6.94 g/mol

N = 14 g/mol

Hence,

The molar mass of Li3N = (6.94 × 3) + 14

= 34.82 g/mol

By substituting the values,

Number of moles = $\frac{Mass of the substance}{Molar mass}$

2.01 = $\frac{Mass of the substance}{34.82}$

Mass of the substance = 34.82 × 2.01

= 69.98 g

Hence, the mass of Li3N in grams is 69.98 ≈ 70 grams

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