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Manganese reacts with hydrochloric acid to produce
Chapter 6, Problem 8SAQ(choose chapter or problem)
Manganese reacts with hydrochloric acid to produce manganese(II) chloride and hydrogen gas.
\(\mathrm{Mn}(s)+2 \mathrm{HCl}(a q) \longrightarrow \mathrm{MnCl}_2(a q)+\mathrm{H}_2(g)\)
When \(0.625 \mathrm{~g} \mathrm{Mn}\) is combined with enough hydrochloric acid to make \(100.0 \mathrm{~mL}\) of solution in a coffee-cup calorimeter, all of the Mn reacts, raising the temperature of the solution from \(23.5^{\circ} \mathrm{C}\) to \(28.8^{\circ} \mathrm{C}\). Find \(\Delta H_{\mathrm{rxn}}\) for the reaction as written. (Assume that the specific heat capacity of the solution is \(4.18 \mathrm{~J} / \mathrm{g}{ }^{\circ} \mathrm{C}\) and the density is \(1.00 \mathrm{~g} / \mathrm{mL}\).)
(a) \(-195 \mathrm{~kJ}\)
(b) \(-3.54 \mathrm{~kJ}\)
(c) \(-1.22 \mathrm{~kJ}\)
(d) \(-2.21 \mathrm{~kJ}\)
Questions & Answers
QUESTION:
Manganese reacts with hydrochloric acid to produce manganese(II) chloride and hydrogen gas.
\(\mathrm{Mn}(s)+2 \mathrm{HCl}(a q) \longrightarrow \mathrm{MnCl}_2(a q)+\mathrm{H}_2(g)\)
When \(0.625 \mathrm{~g} \mathrm{Mn}\) is combined with enough hydrochloric acid to make \(100.0 \mathrm{~mL}\) of solution in a coffee-cup calorimeter, all of the Mn reacts, raising the temperature of the solution from \(23.5^{\circ} \mathrm{C}\) to \(28.8^{\circ} \mathrm{C}\). Find \(\Delta H_{\mathrm{rxn}}\) for the reaction as written. (Assume that the specific heat capacity of the solution is \(4.18 \mathrm{~J} / \mathrm{g}{ }^{\circ} \mathrm{C}\) and the density is \(1.00 \mathrm{~g} / \mathrm{mL}\).)
(a) \(-195 \mathrm{~kJ}\)
(b) \(-3.54 \mathrm{~kJ}\)
(c) \(-1.22 \mathrm{~kJ}\)
(d) \(-2.21 \mathrm{~kJ}\)
ANSWER:Problem 8SAQManganese reacts with hydrochloric acid to produce manganese(II) chloride and hydrogengas.When 0.625 g Mn is combined with enough hydrochloric acid to make 100.0 mL of solutionin a coffee-cup calorimeter, all of the Mn reacts, raising the temperature of the solutionfrom to . Find for the reaction as written. (Assume that the specific heatcapacity of the solution is 4.18 J/g and the density is 1.00 g / mL.)a) -195 kJb) -3.54 kJc) -1.22 kJd)-2.21 kJ Step-by-Step Solution:Step 1 of 5From the given,Mass (m) of manganese Mn = 0.625 gMolar mass of Mn =54.94 g / molVolume =100.0 mLInitial temperature,Final temperatureDensity(d) = 1.00 g / mLHeat capacity