Question

How many grams of CaCl2

Answer 1

Answer:

$\boxed{\text{110.4 g of CaCl _{2 } and 234.5 g of water}}$

Explanation:

1. Mass of CaCl₂

$\text{Let m = mass of CaCl}_{2}\\\\\begin{array}{rcl}\text{Mass percent} & = & \dfrac{\text{Mass of CaCl}_{2}}{\text{Total mass}} \times 100 \%\\\\32.0 \% & = & \dfrac{m}{\text{344.9 g}} \times 100 \% \\\\\text{32.0 \times 344.9 g} & = & 100 m\\\\m & = &\dfrac{\text{32.0 \times 344.9 g}}{100}\\\\ & = &\textbf{110.4 g}\\\end{array}\\\text{You need \boxed{\textbf{110.4 g}} of calcium chloride}$

2. Mass of water

$\text{Let m = mass of water}\\\begin{array}{rcl}\\\text{Mass of water + mass of CaCl}_{2} & = & \text{Mass of solution}\\m + 110.4 & = & 344.9\\m & = &\mathbf{234.5}\\\end{array}\\\text{The mass of water needed is \boxed{\textbf{234.5 g}} }$