Determine whether work is positive, negative, or zero for the following chemical

Question

Determine whether work is positive, negative, or zero for the following chemical processes. Assume the pressure remains constant for all examples. H_2 O(l) rightarrow H_2 O(g) at constant temperature 2 C_8 H_18(l) + 25 O_2(g) rightarrow 16 CO_2(g) + 18 H_2 O(l) at constant temperature CO_2(s) rightarrow CO_2(g) at constant temperature H_2 O(g) rightarrow H_2 O(g) at constant temperature H_2 O(g) at 150 degree C rightarrow H_2 O(g) at 125 degree C N_2(g) + O_2(g) rightarrow 2NO(g) at constant temperature N_2(g) + O_2(g) at 25 degree C rightarrow 2NO(g) at 55 degree C

Explanation / Answer

Work --> P*dV

a)

the system is EXPANDING, so it is Possitive Work done on the surroundings

b)

25 mol of gas form 16 mol of gas... so there is adecrease in volume... Work is done ON the system

c)

Volume increases, so Work is done BY the system

d)

No reaction/effect, W = 0

e)

T decreases, so V msut decrease, so the Work is done ON the system

f)

no change in volume, W = 0

g)

increase of T, increae in Volume, so Work is done BY the system

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