   # Consider a chemical equation with two reactants forming one product. If you know the mass of each reactant, what else do you need to know to determine the mass of the product? Why isn’t the mass necessarily the sum of the mass of the reactants? Provide a real example of such a reaction, and support your answer mathematically. ### Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781337399425

#### Solutions

Chapter
Section ### Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781337399425
Chapter 9, Problem 14ALQ
Textbook Problem
55 views

## Consider a chemical equation with two reactants forming one product. If you know the mass of each reactant, what else do you need to know to determine the mass of the product? Why isn’t the mass necessarily the sum of the mass of the reactants? Provide a real example of such a reaction, and support your answer mathematically.

Interpretation Introduction

Interpretation:

In a chemical reaction, other than the mass of each reactant, the criteria required to determine the mass of product is to be stated. The validation of the fact that the mass of product is not necessarily the sum of mass of reactants is to be stated with the help of an example.

Concept Introduction:

The number of moles is calculated by the formula,

Number of moles=Given massMolar mass

Where, molar mass is the mass of one mole of a substance. One mole contains 6.022×1023 atoms.

### Explanation of Solution

The molar mass of the reactants are also required to calculate the number of moles and determine the limiting reagent and the amount of product formed. The mass of the product is not necessarily equal to the sum of the mass of the reactants.

To prove this mathematically, consider a reaction between hydrogen gas and oxygen gas to produce water.

2H2(g)+O2(g)2H2O(l)

Let the given mass of hydrogen gas be 12.0g and mass of oxygen gas be 64.0g. To calculate the number of moles of gases, the molar mass of gases are required.

The number of moles is calculated by the formula,

Number of moles=Given massMolar mass

Substitute the values of given mass and molar mass of H2 and O2 in the given formula.

The molar mass of H2 is 2.016g.

The number of moles of H2 is,

Number of moles=12.0g2.016g=5.95moles

The number of moles of H2 is 5.95.

The molar mass of O2 is 32g.

The number of moles of O2 is,

Number of moles=64.0g32g=2moles

The number of moles of O2 is 2.

The mole ratio for H2 to O2 is 2:1, that is for two moles of H2, one mole of O2 is required

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