Chapter 4, Problem 86A

Interpretation Introduction

Interpretation : The grams of oxygen used are to be calculated.

Concept Introduction : According to the rule of conservation of mass, mass is conserved during all physical and chemical processes. There is no formation or destruction of mass.

Answer to Problem 86A

There is $\text{48}\text{g}$ of oxygen used to react with hydrogen to form water.

Explanation of Solution

The composition of matter always changes when a chemical reaction takes place.

The mass of the reactants and products are always equal during any chemical reaction.

In the law of conservation of mass, there is no mass lost or gained during the chemical or physical change.

Oxygen and hydrogen react to form water.

The mass of hydrogen is $\text{6}\text{g}$ while the mass of water is $54\text{g}$ .

According to the law of conservation of mass, the sum of the hydrogen and oxygen mass should be equal to the mass of water.

So, the mass of oxygen is given as

  $\begin{array}{c}{\text{m}}_{{\text{O}}_{\text{2}}}\text{=}{\text{m}}_{{\text{H}}_{\text{2}}\text{O}}-{\text{m}}_{{\text{H}}_{\text{2}}}\\ \text{=54}\text{g}-\text{6}\text{g}\\ \text{= 48}\text{g}\end{array}$

There is $\text{48}\text{g}$ of oxygen.