Answer:
a) The reaction is exothermic
b) The temperature of the water goes up
c) The piston move in
d) Work is done on the gas mixture
e) The amount of work done on the gas mixture is given as
W = PΔV
where
W is the work done on the gas mixture
P is the pressure within the cylinder after the reaction
ΔV is the change (a decrease) in volume of the gas mixture
Explanation:
a) Since the chemical reaction is known to release energy into the surrounding, then it is an exothermic reaction.
b) Sine the reaction releases energy into the water, the energy of the water will go up, causing the temperature of the water to go up.
c) The piston will move in, since it was determined from data that the piston does work on the system. When the piston moves in work is done on the system.
d) Work is done on the gas mixture, because the piston moves in, compressing the gas.
e) From basic thermodynamics, we know that when work is done a system, then it means the system is compressed, and the equation for the work done on a system is given as
W = PΔV
where
P is the pressure withing the cylinder
ΔV is the change in the volume of the system. The volume of the system decreases, and hence the work done will be negative.
