Calculations about Masses and Percentage Composition

IMPORTANT

Calculations about Masses and Percentage Composition: Overview

This topic covers concepts, such as, Significance of Law of Conservation of Mass, Determination of Percentage Composition of a Compound, Idea behind the Law of Constant Proportions & Percentage Purity etc.

Important Questions on Calculations about Masses and Percentage Composition

MEDIUM
IMPORTANT
Chemistry>Reacting Masses and Chemical Equations>Calculations about Masses and Percentage Composition> Q 1

State the formula to calculate the percentage purity of pure substances.

EASY
IMPORTANT
Chemistry>Reacting Masses and Chemical Equations>Calculations about Masses and Percentage Composition> Q 2

4 grams of hydrogen reacts with some oxygen to make 36 grams of water. Figure out how much oxygen must have been used by applying the law of conservation of mass?

MEDIUM
IMPORTANT
Chemistry>Reacting Masses and Chemical Equations>Calculations about Masses and Percentage Composition> Q 3

Write about the inspiration behind the law of constant proportions.

MEDIUM
IMPORTANT
Chemistry>Reacting Masses and Chemical Equations>Calculations about Masses and Percentage Composition> Q 4

In some of the chemical reactions, gas is evolved. Will the law of conservation of energy still hold true in that case?