a student has a sample of isopropanol (c3h7oh) that has a mass of 78.6 g. the molar mass of isopropanol is…

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

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

Explanation:

Step1: Recall mole - mass formula

The formula to calculate the number of moles ($n$) is $n=\frac{m}{M}$, where $m$ is the mass and $M$ is the molar mass.

Step2: Substitute given values

Given $m = 78.6\ g$ and $M=60.1\ g/mol$. Then $n=\frac{78.6\ g}{60.1\ g/mol}$.

Step3: Calculate the number of moles

$n=\frac{78.6}{60.1}\approx1.31\ mol$.

Answer:

1.31 moles