Question

An 0.7700 mol sample of an ionic compound has a mass of 126.4 g. Determine the number of formula units of the compound that are present. Express answer in scientific notation.

Answer 1

Answer:

$M=NFU=164.2g/mol$

Explanation:

Hello.

In this case, for the given ionic compound, it is said we have 0.7700 mol in a sample which also weights 126.4 g, it means that number of formula units or molar mass is then:

$M=NFU=\frac{mass}{mol}\\ \\M=NFU=\frac{126.4g}{0.7700mol} \\\\M=NFU=164.2g/mol$

Best regards!