Hess's Law of Constant Heat Summation

JEE Main Chemistry · Chemical Thermodynamics · 7 questions, latest first

• Consider the following data. (i) 2 Al(s)+6 HCl(aq) → Al_2 Cl_6(aq)+3 H_2( g)+1200 kJ / mol (ii) H_2( g)+Cl_2( g) → 2 HCl(g)+164…20262 April, Shift 1 · Q54
• If C( diamond ) → C( graphite )+X kJ mol^-1; C( diamond )+O_2( g) → CO_2( g)+Y kJ mol^-1; C( graphite )+O_2( g) → CO_2( g)+Z kJ…202529 January, Shift 2 · Q54
• S( g)+3/2 O_2( g) → SO_3( g)+2 x kcal; SO_2( g)+1/2 O_2( g) → SO_3( g)+y kcal The heat of formation of SO_2( g) is given by:202524 January, Shift 2 · Q54
• Two reactions are given below: 2 Fe_(s)+3/2 O_2( g) → Fe_2 O_3( s), Δ H^°=-822 kJ / mol; C_(s)+1/2 O_2( g) → CO_(g), Δ H^°=-110…202430 January, Shift 2 · Q82
• Given 2 CO(g)+O_2( g) → 2 CO_2( g) Δ H_1^θ=-x kJ mol^-1 C (graphite) +O_2( g) → CO_2( g) Δ H_2^θ=-y kJ mol^-1 The Δ H^θ for the…202310 April, Shift 1 · Q62
• At 25°C, the enthalpy of the following processes are given: H_2( g)+O_2( g) → 2 OH( g), Δ H^°=78 kJ mol^-1; H_2( g)+1 / 2 O_2( g)…20231 February, Shift 1 · Q53
• The enthalpy change for the conversion of 1/2 Cl_2( g) to Cl^-(aq) is (-) ____ kJ mol^-1 (Nearest integer) Given: Δ_dis H_Cl_2(…202331 January, Shift 1 · Q53