# ercise 9.4 Hydrofluoric acid, an aqueous solution containing dissolved hydrogen fluoride, is used to etch glass by reacting with the silica, SiO 2 , in the glass to produce gaseous silicon tetra fluoride and liquid water. The unbalanced equation is :math&gt; HF ( a q ) + SiO 2 ( s ) → SiF 4 ( g ) + H 2 O ( l ) l type='a'&gt; Calculate the mass of hydrogen fluoride needed to react with 5.68 g of silica. Hint: Think carefully about this problem. What is the balanced equation for the reaction? What is given? What do you need to calculate? Sketch a map of the problem before you do the calculations. Calculate the mass of water produced in the reaction described in part a.

### Introductory Chemistry: A Foundati...

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

Chapter
Section

### Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781337399425
Chapter 9.3, Problem 9.4SC
Textbook Problem
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## ercise 9.4 Hydrofluoric acid, an aqueous solution containing dissolved hydrogen fluoride, is used to etch glass by reacting with the silica, SiO 2 , in the glass to produce gaseous silicon tetra fluoride and liquid water. The unbalanced equation is:math> HF ( a q ) + SiO 2 ( s ) → SiF 4 ( g ) + H 2 O ( l ) l type='a'>Calculate the mass of hydrogen fluoride needed to react with 5.68 g of silica. Hint: Think carefully about this problem. What is the balanced equation for the reaction? What is given? What do you need to calculate? Sketch a map of the problem before you do the calculations.Calculate the mass of water produced in the reaction described in part a.

Interpretation Introduction

(a)

Interpretation:

The mass of hydrogen fluoride needed to react with 5.68g of silica is to be calculated. The balanced equation for the reaction is to be stated.

Concept Introduction:

The formula to calculate number of moles is,

n=mMw

Formula mass is defined as the sum of the average atomic masses of all the atoms present in the chemical formula of any compound.

### Explanation of Solution

The unbalanced chemical equation is,

HF(aq)+SiO2(s)SiF4(g)+H2O(l)

The unbalanced chemical equation shows that in the reactant, one fluorine atom is present whereas in the product four fluorine atoms are present. Similarly, one hydrogen atom is on the reactant side whereas two hydrogen atoms are on the product side.

Therefore, the balanced chemical equation is,

4HF(aq)+SiO2(s)SiF4(g)+2H2O(l)

The molar mass of silica is 60.08g/mol.

The molar mass of hydrogen fluoride is 20.01g/mol

Interpretation Introduction

(b)

Interpretation:

The mass of water produced in the reaction described in part a is to be calculated.

Concept Introduction:

The formula to calculate number of moles is:

n=mMw

Formula mass is defined as the sum of the average atomic masses of all the atoms present in the chemical formula of any compound.

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