Chapter 3.2, Problem 8PP

Interpretation Introduction

Interpretation:

The amount of the oxygen needs to be determined.

Concept introduction:

In a chemical reaction the mass of product and reactant will not change, only the rearrangements of the molecules will take place. The amount of reactant is equals to the amount of the product, and follows the law of conservation of mass.

Answer to Problem 8PP

The amount of oxygen reacted in this reaction is $\text{6}\text{.6}\text{g}$.

Explanation of Solution

The given mass of the magnesium is $\text{10}\text{.0}\text{g}$ and mass of magnesium oxide is $\text{16}\text{.6}\text{g}$ ,

So for the amount of oxygen −

Mass of product = Mass of reactant

Mass of product = mass of magnesium $+$ mass of oxygen

Mass of magnesium oxide = mass of magnesium $+$ mass of oxygen

For the calculation of mass of oxygen

Mass of oxygen = Mass of magnesium oxide − Mass of magnesium

$\text{=16}\text{.6}\text{g}\text{-10}\text{.0}\text{g}\text{=}\text{6}\text{.6}\text{g}$

Conclusion

The given amount of magnesium and oxygen participated in the formation of magnesium oxide, and the amount of magnesium and magnesium oxide is given so the amount of oxygen calculated easily.