Amongst the following, the total number of reactions/processes in which the entropy increases are: (1) 2NaHCO3s → Na2CO3s + CO2g + H2Og (2) A liquid crystalline into a solid (3) Temperature of crystalline solid is raised from zero K to 100 K (4) Hard boiling of an egg (5) Devitrification of glass (6) Stretching of a rubber band (7) Desalination of water (8) NH3g,10 atm → NH3g,1 atom

Engineering

Chemistry

Gibbs Free Energy Calculations and Third Law

First Law and Various Process

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Question

Amongst the following, the total number of reactions/processes in which the entropy increases are:

(1) 2NaHCO₃s → Na₂CO₃s + CO₂g + H₂Og

(2) A liquid crystalline into a solid

(3) Temperature of crystalline solid is raised from zero K to 100 K

(4) Hard boiling of an egg

(5) Devitrification of glass

(6) Stretching of a rubber band

(7) Desalination of water

(8) NH₃g,10 atm → NH₃g,1 atom

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2MgCl ⟶ Mg + MgCl₂ ∆H = ?

Mgs + 1/2Cl₂g ⟶ MgCl ∆H1 = –125 kJ mol^–¹

Mgs + Cl₂g ⟶ MgCl₂∆H₂= –642 kJ mol^–¹

∆H = ∆H₂– 2∆H₁ = –642 – (2 × –125) = – 392 kJ mol^–¹

∴ –49x = – 392

x = 8