Concept explainers
3.16 Balance the following equations.
(a) reaction to produce "super-phosphate" fertilizer:
Ca3(PO4)2(s)+H2SO4(aq)( Ca(H2PO4)2(aq)+CaSO4(s)
(b) reaction to produce diborane, B2H6:
NaBH4(s) + H2SO4(aq) ( B2H6(g) + H2(g) + Na2SO4(aq)
(c) reaction to produce tungsten metal from tungsten(VI)
oxide:
WO3(s)+ H2(g) ( W(s) + H2O(l)
(d) decomposition of ammonium dichromate:
(NH4)2Cr2O7(s)(N2(g)+H2O(l)+Cr2O3(s)
To balance:
reaction to produce "superphosphate" fertilizer:
The equation:
Explanation of Solution
We need to find the stoichiometric coefficient of reactants and products in order to the sum of the mass of the reactants is equal to the sum of the mass of the products. First, we need to balance the atoms that are not hydrogen or oxygen. After that, we have to balance the hydrogens and finally the oxygens. So that, the balanced chemical equation is:
To balance: The equation:
reaction to produce diborane,
Explanation of Solution
We need to find the stoichiometric coefficient of reactants and products in order to the sum of the mass of the reactants is equal to the sum of the mass of the products. First, we need to balance the atoms that are not hydrogen or oxygen. After that, we have to balance the hydrogens and finally the oxygens. So that, the balanced chemical equation is:
To balance: The equation:
reaction to produce tungsten metal from tungsten(VI) oxide:
Explanation of Solution
We need to find the stoichiometric coefficient of reactants and products in order to the sum of the mass of the reactants is equal to the sum of the mass of the products. First, we need to balance the atoms that are not hydrogen or oxygen. After that, we have to balance the hydrogens and finally the oxygens. So that, the balanced chemical equation is:
To balance: The equation:
decomposition of ammonium dichromate:
Explanation of Solution
We need to find the stoichiometric coefficient of reactants and products in order to the sum of the mass of the reactants is equal to the sum of the mass of the products. First, we need to balance the atoms that are not hydrogen or oxygen. After that, we have to balance the hydrogens and finally the oxygens. So that, the balanced chemical equation is:
The balanced equations are:
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Chapter 3 Solutions
CHEM FOR ENGNRNG SDNTS (EBOOK) W/ACCES
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