Chapter 19.1, Problem 11R

To determine

To calculate: the mass of 3.0 mole of calcium.

Answer to Problem 11R

The required mass is 120 g.

Explanation of Solution

Given:

The mass of calcium is 3.0 moles.

Molar mass of calcium is 40 g/mol.

Formula used:

The expression the number of moles can be written as

Mass of Ca = number of moles $\times$ molar mass of Ca...... (1)

Calculation:

Substitute 3.0 moles for the number of moles and 40 g/mol for mass of Ca in the equation (1)

Mass of Ca = number of moles $\times$ molar mass of Ca

  $\begin{array}{c}\text{Mass of Ca }=\text{ number of moles}\times \text{molar mass of Ca}\\ \text{=}\left(\text{3}\text{.0}\text{mole}\right)\text{×}\left(\text{40}\text{g/mole}\right)\\ =120\text{g}\end{array}$

Conclusion:

Hence, the required mass is 120 g.