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m = 100.63 g
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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