Chapter 9, Problem 101A

(a)

Interpretation Introduction

Interpretation: Whether white compound shows law of the law of definite proportions or not is to be stated.

Concept Introduction : Law of definite proportions is also known as law of constant proportion. It stated that a compound always contains a constant and fixed ratio of its constituent elements.

Answer to Problem 101A

The ratios are same for the both the compounds. Thus, the white compound shows the law of definite proportions.

Explanation of Solution

It is given that student heated 5.00 g of a white compound and obtained 3.60 g of a green compound and 1.40 g of colorless gas. Another student heated a 9.00 g sample of the same compound and obtained 6.48 g of a green compound and 2.52 g of colorless gas.

The ratio for the compounds is calculated as follows:

  $\begin{array}{c}\text{White}\text{compound}=\frac{5.00}{9.00}\\ =0.56:1\\ \text{Green}\text{compound}=\frac{3.60}{6.48}\\ =0.56:1\end{array}$

  $\begin{array}{c}\text{Colorless}\text{gas}=\frac{1.40}{2.52}\\ =0.56:1\end{array}$

The ratios are same for the both the compounds. Thus, the white compound shows the law of definite proportions.

(b)

Interpretation Introduction

Interpretation: The grams of colorless gas is to be stated.

Concept Introduction : Law of definite proportions is also known as law of constant proportion. It stated that a compound always contains a constant and fixed ratio of its constituent elements.

Answer to Problem 101A

The grams of colorless gas are 7.84 g.

Explanation of Solution

The 14.0 g of the white compound is heated. The gram of colorless gas is calculated as follows:

The ratio for the compounds is calculated as follows:

  $\begin{array}{c}\text{Colorless}\text{gas}=0.56\times 14.0\text{g}\\ =7.84\text{g}\end{array}$

Thus, the grams of colorless gas are 7.84 g.