Question

How many moles of lithium fluoride (LiF) are present in a 39 gram sample?

Answer 1

`\huge\boxed{\sf n = 1.5\ mol}`

Step-by-step explanation:

Given data:

Mass = m = 39 g

Molar mass = M = 7 + 19 = 26 g/mol

Required:

No. of moles = n = ?

Formula:

`\displaystyle n = (m)/(M)`

Solution:

Put the given data in the above formula.

n = 39/26

n = 1.5 mol

`\rule[225]{225}{2}`