Chapter 14, Problem 124A

Interpretation Introduction

Interpretation:

The unknown elementhave to be found.

Concept introduction:

Mole: The mole is the unit which is used to measure the amount of a substance. A mole can be defined as the number of carbon atoms which is present in exactly 12 g of pure carbon-12. A mole contains 6.023 × 10²³ atoms.

Answer to Problem 124A

The unknown element is antimony(Sb ).

Explanation of Solution

A mole of an element contains 6.023 × 10²³ atoms. So, number of moles in 5.94 × 10²² atoms is equal to = $\frac{5.94\times {10}^{22}}{6.023\times {10}^{23}}\text{ =}\text{0}\text{.0986}$ mole

$\begin{array}{l}Molecularweightoftheelement=\frac{Massofthecomponent}{Numberofmoles}\\ =\frac{12gm}{0.0986mol}=122gm/mol\end{array}$

The atomic mass is 122 amu. The unknown element is antimony(Sb ).