Question

What is the mass of 3.2 moles of h2O ?

Answer 1

Answer:

$\boxed{\text{57.7 g} }$

Explanation:

The first step is to calculate the molar mass of H₂O:

$\begin{array}{rcr}\text{2 H} & = & 2.02\\\text{1 O} & = & 16.00\\\text{TOTAL} & = & \mathbf{18.02}\\\end{array}$

So, 1 mol has a mass of 18.02 g.

Next you calculate the mass of 3.2 mol of H₂O

$\begin{array}{rcl}m & = & \text{3.2 mol H _{2} O} \times \dfrac{\text{18.02 g H _{2} O}}{\text{1 mol H _{2} O}}\\ & = &\boxed{\textbf{57.7 g H _{2} O}} \\\end{array}$