Question

How many moles are there in 4.00 g of ethanol, CH 3CH 2OH?

Answer 1

Answer:

there are 0.087 moles of ethanol in a 4.00 G sample of ethanol

Answer 2

Explanation:

Number of moles present in a substance is equal to the mass divided by molar mass.

Mathematically,      No. of moles = $\frac{mass}{\text{molar mass}}$

As it is given that mass is 4.00 g and molar mass of $CH_{3}CH_{2}OH$ is 46.07 g/mol.

Hence, calculate the number of moles of $CH_{3}CH_{2}OH$ as follows.

                 No. of moles = $\frac{mass}{\text{molar mass}}$

                                       = $\frac{4.0 g}{46.07 g/mol}$

                                       = 0.086 mol

Thus, we can conclude that number of moles of $CH_{3}CH_{2}OH$ present in 4.00 g is 0.086 mol.