Chapter 3.2, Problem 13SSC

(a)

Interpretation Introduction

Interpretation:

The mass of formed sodium chloride needs to be determined.

Concept Introduction: The compound is made up of two or more than two different elements. The compound mass is equal to the mass of both elements. If the compound is composed of only two types of elements, the mass of the compound is calculated by using this formula-

Mass of compound = Mass of element $\text{I +}$ Mass of element $\text{II}$

Answer to Problem 13SSC

The mass of sodium chloride is $\text{58}\text{.44}\text{g}$ .

Explanation of Solution

Given information: Mass of sodium is $\text{22}\text{.99}\text{g}$ and the mass of chlorine is $\text{35}\text{.45}\text{g}$ in the sample.

The mass of the product is calculated as −

  $\text{Mass}\text{of}\text{compound}\text{=}\text{Mass}\text{of element}\text{I+}\text{Mass}\text{of element}\text{II}$

Mass of sodium = $\text{22}\text{.99}\text{g}$

Mass of chlorine = $\text{35}\text{.45}\text{g}$

Mass of sodium chloride = Mass of sodium + Mass of chlorine

           = $\text{22}\text{.99}\text{g}\text{+}\text{35}\text{.45}\text{g}$

          $\text{=}\text{58}\text{.44}\text{g}$

The mass of sodium chloride is calculated by the given mass of sodium and the mass of chlorine. For the mass of a compound, the mass of both elements is necessary.

(b)

Interpretation Introduction

Interpretation:

The mass of the compound Y needs to be determined.

Concept Introduction: The compound is made up of two or more than two different elements. The compound mass is equal to the mass of both elements. If the compound is composed of only two types of elements, the mass of the compound is calculated by using this formula-

Mass of compound = Mass of element $\text{I +}$ Mass of element $\text{II}$

Answer to Problem 13SSC

The mass of compound Y $\text{=}66.7\text{g}$ .

Explanation of Solution

Given information: Mass of compound X is $12.2\text{g}$ and the mass of XY is $\text{78}\text{.9}\text{g}$ in the sample.

The mass of the product is calculated as −

Mass of compound = Mass of element $\text{I +}$ Mass of element $\text{II}$

Mass of compound $\text{II}$ = Mass of compound $\text{-}$ Mass of element $\text{I}$

Mass of sample Y = Mass of XY − Mass of sample X

  $\text{= 78}\text{.9}\text{g}-12.2\text{g}$

  $\text{=}66.7\text{g}$

The mass of sample Y is calculated by the given mass of sample X and the mass of compound XY. For the mass of a compound, the mass of both elements is necessary.