Question

What is the number of moles of potassium chloride present in 148 g of kcl?

Answer 1

The number of moles of one substance given the amount in mass can be calculated by the use of the molar mass. This is the mass of a compound per 1 mol of the said substance. For, KCl the molar mass is 74.55 g/ mol

148 g / 74.55 g/mol = 2 mol KCl

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Answer 2

Answer : The number of moles of potassium chloride is, 1.99 moles.

Explanation : Given,

Mass of KCl = 148 g

Molar mass of KCl = 74.5 g/mol

Formula used :

$\text{Moles of }KCl=\frac{\text{Mass of }KCl}{\text{Molar mass of }KCl}$

Now put all the given values in this formula, we get the moles of KCl.

$\text{Moles of }KCl=\frac{148g}{74.5g/mol}=1.99mole$

Therefore, the number of moles of potassium chloride is, 1.99 moles.