Chemistry question??! thermodynamics. HELP!?

Posted on 2014-11-20 07:02:00 in Chemistry by PETTER

Need help with this.. pretty lengthy but still. please help.

Magnesium flakes were added to an open polystyrene cup filled with 50.0 mL of 1.00 M HCl solution. Assume the
specific heat of the solution to be 4.18 J/g°C.

Mg(s) + 2 HCl(aq) ? MgCl2(aq) + H2(g)

?Hrxn = ?316.0 kJ mol?1

(a) If 0.650 g of the magnesium were added, determine the total amount of heat released into the calorimeter.

(b) Determine the temperature change in the calorimeter.

(c) Draw an energy diagram and label the enthalpy change, ?H, for the reaction.
The hydrogen gas produced in the reaction of magnesium and HCl was captured and placed in a sealed container, which
occupies a volume of 650 mL at a constant pressure of 1.0 atm. The temperature of the container and gas was changed by
15°C; the resulting volume of the gas in the container is 620 mL.

Just need to know if endothermic or exothermic..

(d) Is the temperature of the system increasing or decreasing. Justify your answer

(e) Calculate the amount of work done, in Joules (J).

(f) Is the statement in the box below correct? Justify your answer.
The gas collected in the container does work on the
surroundings

thank yall so much

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