Without doing any calculations, determine the sign of δssys for each of the following chemical reactions.2o3(g)→3o2(g)2h2s(g)+3o2( g)→2h2o(g)+2so2(g)so3(g)+h2o(l)→h2s o4(l)pcl3(l)+cl2(g)→pcl5(s)δssys greater than 0 or δssys smaller than 0

a) : > 0

b) : < 0

c) : <0

d)  : < 0

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

is positive when randomness increases and is negative when randomness decreases.

a)

As 2 moles of gaseous reactants are converted to 3 moles of gaseous products , randomness increases and thus sign of  is positive.

b)

As 5 moles of gaseous reactants are converted to 4 moles of gaseous products , randomness decreases and thus sign of  is negative.

c)

As gas is changing to liquid, randomness decreases and thus sign of is negative.

d)

As gaseous and liquid reactants are converted to solid products , randomness decreases and thus sign of is negative

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