   # For each of the following unbalanced equations, calculate how many grants of each product would be produced by complete reaction of 12.5 g of the reactant indicated in boldface. Indicate clearly the mole ratio used for the conversion. msp; TiBr 4 ( g ) + H 2 ( g ) → Ti ( s ) + HBr ( g ) msp; SiH 4 ( g ) + NH 3 ( g ) → Si 3 N 4 ( s ) + H 2 ( g ) msp; NO ( g ) + H 2 ( g ) + 2 H 2 O ( l ) msp; Cu 2 S ( s ) → Cu ( s ) + S ( g ) ### 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 25QAP
Textbook Problem
133 views

## For each of the following unbalanced equations, calculate how many grants of each product would be produced by complete reaction of 12.5 g of the reactant indicated in boldface. Indicate clearly the mole ratio used for the conversion.msp;  TiBr 4 ( g ) + H 2 ( g ) → Ti ( s ) + HBr ( g ) msp;  SiH 4 ( g ) + NH 3 ( g ) → Si 3 N 4 ( s ) + H 2 ( g ) msp;  NO ( g ) + H 2 ( g ) + 2 H 2 O ( l ) msp;  Cu 2 S ( s ) → Cu ( s ) + S ( g )

Interpretation Introduction

(a)

Interpretation:

The given reaction should be balanced first and the grams of each product produced by complete reaction of 12.5 g of the reactant (in bold) should be calculated.

Concept Introduction:

It is important to recognize that the coefficients in a balanced equation that gives the relative number of molecules.

Because atoms are not changed or destroyed in a chemical reaction one must always balance a chemical reaction. That is, one must choose the coefficients that give the same number of each type of atoms on both sides, using the smallest set of integers.

The mass, number of moles and molar mass of a substance are related to each other as follows:

n=mM

Here, n is number of moles, m is mass and M is molar mass.

### Explanation of Solution

The unbalanced chemical reaction is as follows:

TiBr4(g)+H2(g)Ti(s)+HBr(g)

To balance the bromine atom, give coefficient 4 to HBr thus,

TiBr4(g)+H2(g)Ti(s)+4HBr(g)

Now, give coefficient 2 to H2 to balance the hydrogen atoms thus,

TiBr4(g)+2H2(g)Ti(s)+4HBr(g)

From the balanced chemical reaction, 2 mol of hydrogen gas gives 1 mol of Ti and 4 mol of HBr.

Calculating mass of Ti from 12.5 g of hydrogen gas:

Since, 2 mol of hydrogen gas gives 1 mol of Ti thus, 1 mol of hydrogen gas gives 0.5 mol of Ti.

The mass of hydrogen gas is 12.5 g and molar mass is 2 g/mol thus, number of moles can be calculated as follows:

n=mM

Putting the values,

n=12.5 g2 g/mol=6.25 mol

The number of moles of Ti obtained from 6

Interpretation Introduction

(b)

Interpretation:

The given reaction should be balanced first and the grams of each product produced by complete reaction of 12.5 g of the reactant (in bold) should be calculated.

Concept Introduction:

It is important to recognize that the coefficients in a balanced equation that gives the relative number of molecules.

Because atoms are not changed or destroyed in a chemical reaction one must always balance a chemical reaction. That is, one must choose the coefficients that give the same number of each type of atoms on both sides, using the smallest set of integers.

The mass, number of moles and molar mass of a substance are related to each other as follows:

n=mM

Here, n is number of moles, m is mass and M is molar mass.

Interpretation Introduction

(c)

Interpretation:

The given reaction should be balanced first and the grams of each product produced by complete reaction of 12.5 g of the reactant (in bold) should be calculated.

Concept Introduction:

It is important to recognize that the coefficients in a balanced equation that gives the relative number of molecules.

Because atoms are not changed or destroyed in a chemical reaction one must always balance a chemical reaction. That is, one must choose the coefficients that give the same number of each type of atoms on both sides, using the smallest set of integers.

The mass, number of moles and molar mass of a substance are related to each other as follows:

n=mM

Here, n is number of moles, m is mass and M is molar mass.

Interpretation Introduction

(d)

Interpretation:

The given reaction should be balanced first and the grams of each product produced by complete reaction of 12.5 g of the reactant (in bold) should be calculated.

Concept Introduction:

It is important to recognize that the coefficients in a balanced equation that gives the relative number of molecules.

Because atoms are not changed or destroyed in a chemical reaction one must always balance a chemical reaction. That is, one must choose the coefficients that give the same number of each type of atoms on both sides, using the smallest set of integers.

The mass, number of moles and molar mass of a substance are related to each other as follows:

n=mM

Here, n is number of moles, m is mass and M is molar mass.

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