Chapter 19, Problem 16STP

Interpretation Introduction

Interpretation:

The chemical which has greatest molar mass out of given five is to be calculated.

Concept introduction:

Molar mass of a compound is sum of the average mass of all the atoms present in it.

It can be calculated as:

$\begin{array}{l}M=x_1{M}_1+x_2{M}_2+\mathrm{..........}\\ where\\ M_{i}aremassesofatoms\\ x_{i}arecorrespondingnumberofatoms\end{array}$

Answer to Problem 16STP

Chemical C has greatest molar mass

Explanation of Solution

$\begin{array}{l}{M}_{KCl}=19+35.5\\ =54.5g/mol\\ M_{C{H}_{3}OH}=12+3\times 1+16+1\\ =32g/mol\\ M_{Ba{\left(OH\right)}_2}=137+2\times \left(16+1\right)\\ =171g/mol\\ M_{C{H}_{3}COOH}=12\times 2+16\times 2+1\times 4\\ =60g/mol\\ M_{NaOH}=23+16+1\\ =40g/mol\end{array}$

Thus barium hydroxide has greater molar mass.

Conclusion

Thus barium hydroxide has greater molar mass.