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?

1) 0.765 moles
2) 1.31 moles
3) 78.6 moles
4) 4,720 moles

Answer 1

To calculate the number of moles of isopropanol in the sample, divide the mass of the sample by the molar mass of isopropanol, resulting in 1.31 moles.

Step-by-step explanation:

To calculate the number of moles of isopropanol in the sample, we need to divide the mass of the sample by the molar mass of isopropanol.

Given: Mass of isopropanol = 78.6 g, Molar mass of isopropanol = 60.1 g/mol.

Moles of isopropanol = Mass / Molar mass = 78.6 g / 60.1 g/mol = 1.31 moles.

Therefore, there are 1.31 moles of isopropanol in the given sample.