Sort out the exothermic and endothermic reactions among the following:
(i) `C (s) + 2H_2(g) to CH_4(g) , DeltaH = - 17.89 cal`
(ii) `CO(g) + 1/2O_2(g) to CO_2(g) = +284.5 kJ`
(iii) `2HCl (g) to 2H(g) + 2Cl(g), DeltaH = + 857 kJ`
(iv) `Cl_2(g) + 242kJ to 2Cl(g)`

H_2(g) + I_2(g) to 2HI(g) , DeltaH = 52.2 kJ 2HI(g) to H_2(g) + I_2(g), DeltaH = kJ

H_2(g) + 1/2 O_2(g) to H_2O (l), DeltaH = - 286 kJ 2H_2(g) + O_2(g) to 2H_2O (l), DeltaH = …kJ

N_2(g) + 3H_2(g) to 2NH_3(g) , DeltaH = -92.3kJ 2NH_3(g) to N_2(g) + 3H_2(g) , Delta H = …….kJ

Calculate the heat of formation of glucose from the following data, C(s) + O_2(g) to CO_2(g) , DeltaH =-395.0 kJ H_2(g) + 1/2O_2(g) to H_2O (l) , DeltaH = - 269.4 kJ C_6H_12O_6 (s) + 6O_2(g) to 6CO_2(g) + 6H_2O(l), DeltaH =- 2900 kJ

Calculate the heat of formation of methanol (CH_3OH) from thhe following data: CH_3OH(l) + 3/2O_2(g) to CO_2(g) + 2H_2O (l),Delta =-726 kJ C(s) + O_2(g) to CO_2(g) , DeltaH = -394 kJ H_2(g) + 1/2 O_2(g) to H_2O(l) , Delta H = -286 kJ

Calculate the heat of formation of anhydrous Al_2Cl_6 from the following data: (i) 2Al + 6HCl (aq) to Al_2Cl_6 (aq) + 3H_2(g), DeltaH = - 239.76 kcal (ii) Al_2Cl_6 (s) + aq to Al_2Cl_6(aq), DeltaH = - 153.69 kcal (iii) H_2(g) + Cl_2(g) to 2HCl (g) , DeltaH = -44kcal (iv) HCl (g) + aq to HCl (aq), DeltaH = - 17.31 kcal

Calculate the heat of combustion of benzene form the following data: a. 6C(s) +3H_(2)(g) rarr C_(6)H_(6)(l), DeltaH = 49.0 kJ b. H_(2)(g) +1//2O_(2)(g) rarr H_(2)O(l), DeltaH =- 285.8 kJ c. C(s) +O_(2) (g) rarr CO_(2)(g), DeltaH =- 389.3 kJ

Calculate enthalpy of formation of methane (CH_4) from the following data : (i) C(s) + O_(2)(g) to CO_(2) (g) , Delta_rH^(@) = -393.5 KJ mol^(-1) (ii) H_2(g) + 1/2 O_(2)(g) to H_(2)O(l) , Deta_r H^(@) = -285.5 kJ mol^(-1) (iii) CH_(4)(g) + 2O_(2)(g) to CO_(2)(g) + 2H_(2)O(l), Delta_(r)H^(@) = -890.3 kJ mol^(-1) .

CH_4(g) + 2O_2(g) to CO_2(g) + 2H_2O(g), Delta H = -809 kJ The calorific value of 1 kg of CH_4(g) is ………… kJ/kg.

C(s)+(1)/(2)O_(2)(g)to CO(g), Delta H =- 42 kJ/mole CO(g)+(1)/(2)O_(2)(g)to CO_(2)(g) , Delta H =-24 kJ/mole The heat of formation of CO_(2) is