   Chapter 3, Problem 68GQ

Chapter
Section
Textbook Problem

Balance the following equations:(a) for the reaction to produce "superphosphate" fertilizerCa3(PO4)2(s) + H2SO4(aq) → Ca(H2PO4)2(aq) + CaSO4(s)(b) for the reaction to produce diborane,B2H6 NaBH4(s) + H2SO4(aq) → B2H6(g) + H2(g) + Na2SO4(aq)(c) for the reaction to produce tungsten metal from tungsten(VI) oxideWO3(s) + H2(g) →W(s) + H2O(ℓ)(d) for the decomposition of ammonium dichromate(NH4)2Cr2O7(s) → N2(g) + H2O(ℓ) + Cr2O3(s)

(a)

Interpretation Introduction

Interpretation:

The equation for the reaction to gives superphosphate fertilizer has to be balanced.

Concept introduction:

The law of conservation of mass states that no atoms can be created or destroyed in a chemical reaction, therefore, the number of atoms present in the reactants is equal to the number of atoms present in the products.

Explanation

Tricalcium phosphate is reacts with sulfuric acid which forms Calcium dihydrogen phosphate and calcium sulfate, the balanced equation for the formation of Calcium dihydrogen phosphate is given above.

Balance the equation,

Balance the hydrogen atom in the given equation, when balancing the equation, we should not alter the subscripts and we can change coefficients.  There are two hydrogen atoms in the left side and four hydrogen atoms in the right side.  Therefore two molecule of sulfuric acid is added to left side of reaction.  Therefore the balanced equation is given below.

(b)

Interpretation Introduction

Interpretation:

The equation for the reaction to gives superphosphate fertilizer has to be balanced.

Concept introduction:

The law of conservation of mass states that no atoms can be created or destroyed in a chemical reaction, therefore, the number of atoms present in the reactants is equal to the number of atoms present in the products.

(c)

Interpretation Introduction

Interpretation:

The equation for the reaction to gives superphosphate fertilizer has to be balanced.

Concept introduction:

The law of conservation of mass states that no atoms can be created or destroyed in a chemical reaction, therefore, the number of atoms present in the reactants is equal to the number of atoms present in the products.

(d)

Interpretation Introduction

Interpretation:

The equation for the reaction to gives superphosphate fertilizer has to be balanced.

Concept introduction:

The law of conservation of mass states that no atoms can be created or destroyed in a chemical reaction, therefore, the number of atoms present in the reactants is equal to the number of atoms present in the products.

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