Question

Choose the reaction with negative DS value.
(a) 2NaHCO₃₍ₛ₎ → Na2CO₃₍ₛ₎ + CO₂(g) + H₂O(g)
(b) Cl₂(g) → 2Cl(g)
(c) 2SO₂(g) + O₂(g) → 2SO₃(g)
(d) 2KClO₃₍ₛ₎ → 2KCl₍ₛ₎ + 3O₂(g)

Answer 1

answer : option (c) 2SO₂(g) + O₂(g) → 2SO₃(g)

concept : ∆S > 0 when number of gaseous molecules of products > number of gaseous molecule of reactants

∆S < 0 when number of gaseous molecules of products < number of gaseous molecules of reactants

here option (c) 2SO₂(g) + O₂(g) → 2SO₃(g)

number of gaseous molecules of products < number of gaseous molecules of reactants

so, ∆S < 0 hence option (c) is correct choice.

also read similar questions : Calculate the heat of formation of gaseous ethyl alcohol,

2C(graphite) + 3H2(g) +12 O2(g) → C2H5OH (g) given that enthal...

https://brainly.in/question/12808774

Calculate the enthalpy change for the reaction

H2(g)+ Br2(g)2HBr(g)Given :Bond enthalpy of H—H = 435 kJ mol-1Bond enthal...

https://brainly.in/question/2928687