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In: Chemistry

Using the date in the appendix of text, calculate the standard enthalpy change for each of...

Using the date in the appendix of text, calculate the standard enthalpy change for each of the following reaction.

(A) Si (s) + 2F2(g) -------- SiF4 (g)

(B) 2C(s) + 2H2(g) -------- CH3CO2 H(i)

(C) CH4(g) + N2 (g) -------- HCN (g)+ NH3 (g)

(D) CS2 (g) + 3Cl2 (g) ------ CCl4 (g) + S2 Cl2 (g0

Expert Solution

(A)

deltaH⁰_rxn = deltaH⁰_f(SiF₄) - deltaH⁰_f(Si) - 2 * deltaH⁰_f(H₂) = - 1615 - 0 - 2 ( 0 ) = - 1615 kJ

(B)

deltaH⁰_rxn = deltaH⁰_f(CH₃COOH) - 2 * deltaH⁰_f(C) - 2 * deltaH⁰_f(H₂) = - 483.5 - 0 - 2 ( 0 ) = - 483.5 kJ

(C)

deltaH⁰_rxn = deltaH⁰_f(HCN) - deltaH⁰_f(NH₃) - deltaH⁰_f(CH₄) - deltaH⁰_f(N₂)

= 135.14 - 46.2 - ( - 74.8 ) - ( 0 )

= 163.74 kJ

(D)

deltaH⁰_rxn = deltaH⁰_f(CCl₄) + deltaH⁰_f(S₂Cl₂) - deltaH⁰_f(CS₂) - 3 * deltaH⁰_f(Cl₂)

= - 135 - 18 - 117 - 3 ( 0 )

= - 270 kJ

queen_honey_blossom answered 2 years ago

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