Name: Avogadro's Law and Its Uses
Uploaded: 2019-07-19
Duration: 10 min 28 s
Description: Avogadro's law is an experimental gas law relating the volume of a gas to the amount of substance of gas present. Let us learn more through this video.

Question

Phosphorus and chlorine form two compounds. The first compound contains

22.54 %

by mass of phosphorus and

77.46 %

by mass of chlorine. In the second compound the percentages are

14.88

for phosphorus and

85.12

for chlorine. Show that these data are consistent with the law of multiple proportions.

Accepted Answer

According to the law of multiple Proportion, the ratio of mass of an element react with a fixed mass of another element is always a simple whole number ratio.

In the first compound, percentage of phosphorus = $22.54$

Thus, percentage of chlorine = $100 - 22.54 = 77.46$ Thus, $22.54 g$ of phosphorus combines with $77.46 g$ of chlorine.

In the second compound, percentage of phosphorus = $14.88$

Thus, percentage of chlorine $100 - 14.88 = 85.12$ Thus, $14.88 g$ of phosphorus combine with $85.12 g$ of chlorine.

Let us fix the mass of phosphorus as $1 g$ and find the different masses of chlorine which combine with $1 g$ of phosphorus in two compounds.

In the first compound, mass of chlorine which combines with $22.54 g$ of phosphorus = $77.46 g$

The mass of chlorine which combines with 1 g of phosphorus $\frac{77.46}{22.54} = 3.43$ $g$

In the second compound, mass of chlorine which combines with $14.88 g$ of phosphorus = $85.12 g$

Mass of chlorine which combines with $1 g$ of phosphorus $\frac{85.12}{14.88} = 5.72$ g

The ratio of the masses of chlorine which combines with the fixed mass of phosphorus ( $1 g$ ) in the two compounds is $3.43 : 5.72 = 1 : 1.66$ or $3 : 5$ (approximately) This is a simple whole number ratio.

Therefore, the data is in agreement with the law of multiple proportions.

Important Questions on Some Basic Concepts, Mole Concept and Stoichiometry

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Phosphorus and chlorine form two compounds. The first compound contains 22.54% by mass of phosphorus and 77.46%by mass of chlorine. In the second compound the percentages are 14.88 for phosphorus and 85.12 for chlorine. Show that these data are consistent with the law of multiple proportions.

Important Questions on Some Basic Concepts, Mole Concept and Stoichiometry

Learn and Prepare for any exam you want !