Of the following reactions occurring at 25ºc, which one involves the greatest increase in entropy? h2(g) + cl2(g) = 2 hcl(g)h2o(s) = h2o(l)pb2+(aq) + 2 cl-(aq) = pbcl2(s)co2(s) = co2(g)

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)

2 molesof gas are converting to 2 moles of another gas , thus is zero.

b)

1 mole of solid is converting to 1 mole of liquid, the randomness increases and thus is positive.

b)

2 moles of ions are converting to 1 mole of solid, the randomness decreases and thus is negative

d)

1 mole of solid is converting to 1 mole of gas, the randomness increases drastically and thus is highly positive.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock