Question

A student has a sample of isopropanol (C3H7OH) that has a mass of 78. 6 g. The molar mass of isopropanol is 60. 1 g/mol. How many moles of isopropanol are contained in this sample? 0. 765 moles 1. 31 moles 78. 6 moles 4,720 moles.

Answer 1

Mole is the ratio of the mass to the molar mass of the substance and its unit is mol. The moles of isopropanol in the sample are 1. 31 moles.

What are moles?

Moles are the unit of measurement of the smallest entity of atoms, molecules, and compounds.

Given,

Mass of isopropanol (m) = 78. 6 g

Molar mass of isopropanol = 60. 1 g/mol

Moles of isopropanol is calculated as:

$\begin{aligned} \rm moles (n) &= \rm \dfrac{mass}{molar \; mass}\\\\&= \dfrac{78.6}{60.1}\\\\&= 1.31\;\rm moles\end{aligned}$

Therefore, moles of isopropanol are option b. 1.31 moles.

Learn more about moles here:

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