Problem: Manganese reacts with hydrochloric acid to produce manganese(II) chloride and hydrogen gas.Mn(s) + 2 HCl(aq) → MnCl2(aq) + H2(g)When 0.630 g Mn is combined with enough hydrochloric acid to make 100.0 mL of solution in a coffee-cup calorimeter, all of the Mn reacts, raising the temperature of the solution from 23.6 ˚C to 28.8 ˚C.Find ΔHrxn for the reaction as written. (Assume that the specific heat capacity of the solution is 4.18 J/g • ˚C and the density is 1.00 g/mL)

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FREE Expert Solution

m = 0.630 g  + (100.0 mL ×1 g1 mL) 

m = 100.63 g


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Problem Details

Manganese reacts with hydrochloric acid to produce manganese(II) chloride and hydrogen gas.
Mn(s) + 2 HCl(aq) → MnCl2(aq) + H2(g)

When 0.630 g Mn is combined with enough hydrochloric acid to make 100.0 mL of solution in a coffee-cup calorimeter, all of the Mn reacts, raising the temperature of the solution from 23.6 ˚C to 28.8 ˚C.
Find ΔHrxn for the reaction as written. (Assume that the specific heat capacity of the solution is 4.18 J/• ˚C and the density is 1.00 g/mL)

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Based on our data, we think this problem is relevant for Professor Gonzalez's class at UM.