Manganese reacts with hydrochloric acid to produce manganese ( I I ) chloride an

Question

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

Mn(s)+2HCl(aq)----->  MnCl2(aq)+H2(g)

When 0.605g 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 23.2C to 29.5
C

â

Find DeltaHrxn for the reaction as written. (Assume that the specific heat capacity of the solution is 4.18 J/gggC

and the density is 1.00 g/mL.)

PLEASE explain your steps as well, thanks!

Explanation / Answer

4.18 J/g*C as the specific heat capacity means that each degree of temperature raised per ml of liquid is equivalent to 4.18J of heat.

Since have 100 mL, , we have 100 mL * 4.18 J/(g*C) * 1g/mL = 418 J per 54.1mL per degree C of temperature change.

Since the temperature was raised by 23.2

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