Question

Predict the sign of ΔS for each of the following; explain your reasoning

O_2(g) → O_2(l)

2 KClO_4(s) → 2 KClO_3(s) + O_2(g)

CH_4(g) + 2 O_2(g) → CO_2(g) + 2 H₂O_(l)

Answer 1

Entropy is the degree of disorderness Or randomness is called entropy

DeltaS=products entropy-reactants entropy

Here oxygen gas is converted to liquid so the entropy is decreased

So DeltaS<0 (Negative)

Here 2 moles of solid is converted to 2 moles of solid+one mole of gas

So the entropy is increased

So deltaS is positive

C.

3 moles of gas is converted to one mole of gas + 2 moles of liquid

So deltaS is negative