(Solved): Manganese reacts with hydrochloric acid to produce manganese(II) chloride and hydrogen gas. \[ \mat ...

Manganese reacts with hydrochloric acid to produce manganese(II) chloride and hydrogen gas. \[ \mathrm{Mn}(s)+2 \mathrm{HCl}(a q) \rightarrow \mathrm{MnCl}_{2}(a q)+\mathrm{H}_{2}(g) \] You may want to reference (Page) Section \( 6.7 \) while completing this problem. Part A When \( 0.645 \mathrm{~g} \mathrm{Mn} \) is combined with enough hydrochloric acid to make \( 100.0 \mathrm{~mL} \) of solution in a colfee-cup calorimeter, all of the Mn reacts, raising the temperature of the solution from \( 23.5^{\circ} \mathrm{C} \) to \( 28.1^{\circ} \mathrm{C} \). Find \( \Delta H_{\mathrm{ren}} \) 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 \( 1.00 \) \( \mathrm{g} / \mathrm{mL} \).) Express your answer using three significant figures.