Chapter 17.2, Problem 13R

To determine

To Calculate: The mass of the NaCl unit if masses of chlorine and sodium is given.

Answer to Problem 13R

  $58.5\text{g}$

Explanation of Solution

Given info:

The mass of chlorine and sodium atom are $\text{35}\text{.5 g }\text{and }\text{23}\text{.0 g}$ respectively.

Formula used:

The formula for mass of a compound AB unit is:

  $m_{AB}=m_A+m_B$

Calculation:

In the given compound NaCl, the sodium and chlorine atoms are present in the $1:1$ ratio.So, the mass of the NaCl unit is,

  $\begin{array}{l}{m}_{NaCl}=m_{Na}+M_{Cl}\\ =\text{23}\text{.0 g + 35}\text{.5 g}\\ \text{=}\text{58}\text{.5 g}\end{array}$

Conclusion:

The mass of the NaCl unit is $58.5\text{g}$ .