Calculate q for this process. (Given: Specific heat of solution = 4.184 J/g deg)

Question

Calculate q for this process. (Given: Specific heat of solution = 4.184 J/g deg) Use your value for q to calculate Delta H^0 for NaOH(aq) + HCI(aq) rightarrow H_2O(l) + NaCI(aq) Delta H^o = ? Given these two equations, calculate Delta H^o for the third one. CH_4(g) + H_2O(g) rightarrow 3 H_2(g) + CO(g) Delta H^o = +206 kJ H_2(g) + CO_2(g) rightarrow H_2O(g) + CO(g) Delta H^o = +41 kJ CH_4(g) + 2 H_2O(g) rightarrow 4 H_2(g) + CO_2(g) Delta H^o = ? Estimate Delta H^o for the reaction: N-O(g) + Br-Br(g) rightarrow Br-N-O(g) + Br(g) Delta H^o = ? Table of Bond Dissociation Energies

Explanation / Answer

25) No process given

26) related to 25

27) To calcualte Delta H for the equation

CH4 + 2H2O --> CO2 + 4H2 ......(3)

from these equations

CH4 + H2O --> 3H2 + CO ........(1) delta H = 206

H2 + CO2 --> H2O + CO............(2) Delta H = 41

So as per equations

equation 3 = equation 1 - equation (2)

So Delta H (3) = Delta H (1) - Delta H (2)

Delta H (3)= 206- 41 = 165 KJ

28) Delta H of reaction = Sum of bond energies of reactants - Sum of bond energies of products

Delta H of reaction = (B.E N-O + B.E. Br-Br] - [B.E. Br- N + B.E. N-O ]

Delta H = [200 + 193] - [ 240 + 200] = -47 KJ / mol

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