Question

A student has a 1g sample of each of the following compounds: NaCl, KBr, and KCL Which of the following lists the samples in order of increasing number of moles in the sample?

Answer 1

Given :

A student has a 1 g sample of each of the following compounds: NaCl, KBr, and KCl.

To Find :

The samples in order of increasing number of moles in the sample.

Solution :

Molecular mass of NaCl, KBr, and KCl is 58.5 g/mol , 119 g/mol and

74.5 g/mol respectively .

Moles of NaCl , $n_1=\dfrac{1}{58.5}=0.017\ mol$.

Moles of KBr , $n_2=\dfrac{1}{119}=0.008\ mol$.

Moles of KCl , $n_2=\dfrac{1}{74.5}=0.013\ mol$.

The order of moles in increasing order is :

KBr , KCl and NaCl .

Hence , this is the required solution .