Question

How many moles of LiF are present in 34.58 g?
O 0.3998 mol
O 1.333 mol
2.500 mol
36.32 mol

Answer 1

Answer:

1.33moles

Explanation:

Given parameters:

Mass of LiF  = 34.58g

Unknown:

Number of moles of LiF = ?

Solution:

To solve this problem, we need to find the molar mass of LiF first.

 Molar mass of LiF  = 7 + 19  = 26g/mol

Number of moles of LiF  = $\frac{mass}{molar mass}$  

 So;

 Number of moles of LiF  = $\frac{34.58}{26}$   = 1.33moles