Question

1. how many moles are represented by 11.5 g of c₂h₅oh?

Explanation:

Step1: Calculate molar mass of $\text{C}_2\text{H}_5\text{OH}$

Molar mass = $2\times12.01 + 6\times1.008 + 16.00 = 46.07\ \text{g/mol}$

Step2: Use mole formula ($n=\frac{m}{M}$)

$n=\frac{11.5\ \text{g}}{46.07\ \text{g/mol}}$

Answer:

$0.250$ moles