Chapter 4: Q71E (page 223)
Outline the steps needed to determine the limiting reactant when 0.50 mol of Cr and 0.75 mol of H3PO4 react according to the following chemical equation.\(2Cr + 2{H_3}P{O_4} \to 2CrP{O_4} + 3{H_2}\). Determine the limiting reactant.
Cr is the limiting reactant.
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In a common medical laboratory determination of the concentration of free chloride ion in blood serum, a serum sample is titrated with a Hg(NO3)2 solution.
2Cl−(aq) + Hg(NO3)2(aq)⟶2NO3−(aq) + HgCl2(s)
What is the Cl− concentration in a 0.25-mL sample of normal serum that requires 1.46 mL of 8.25×10−4MHg(NO3)2(aq) to reach the end point?
How many NH3 molecules are produced by the reaction of 4 mol of Ca(OH)2 according to the following reaction
\({\left( {N{H_4}} \right)_2}S{O_4} + Ca{\left( {OH} \right)_2} \to 2N{H_3} + CaS{O_4} + 2{H_2}O\)
Use the following equations to answer the next four questions:
i.\({H_2}O\left( s \right) \to {H_2}O\left( l \right)\)
ii.\(N{a^ + }\left( {aq} \right) + C{l^ - }\left( {aq} \right) + A{g^ + }\left( {aq} \right) + NO_3^ - \left( {aq} \right) \to AgCl\left( s \right) + N{a^ + }\left( {aq} \right) + NO_3^ - \left( {aq} \right)\)
iii.\(C{H_3}OH\left( g \right) + {O_2}\left( g \right) \to C{O_2}\left( g \right) + {H_2}O\left( g \right)\)
iv. \(2{H_2}O\left( l \right) \to 2{H_2}\left( g \right) + {O_2}\left( g \right)\)
v. \({H^ + }\left( {aq} \right) + O{H^ - }\left( {aq} \right) \to {H_2}O\left( l \right)\)
(a) Which equation describes a physical change?
(b)Which equation identifies the reactants and products of a combustion reaction?
(c)Which equation is not balanced?
(d)Which is a net ionic equation?
Write a balanced molecular equation describing each of the following chemical reactions.
(a) Solid calcium carbonate is heated and decomposes to solid calcium oxide and carbon dioxide gas
(b)Gaseous butane reacts with diatomic oxygen gas to yield gaseous carbon dioxide and water vapor
(c)Aqueous solution of magnesium chloride and sodium hydroxide react to produce solid magnesium hydroxide and aqueous sodium chloride
(d) Water vapor reacts with sodium metal to produce solid sodium hydroxide and hydrogen gas.
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