If heat of formation of PCl 3 ( g ) and PH 3 ( g ) are 140 and 8 KJ mol − 1 respectively and heat of atomization of phosphorous P 4 ( s ) , chlorine and hydrogen are 320 , 120 & 216 K J m o l −

Question

If heat of formation of PCl 3 ​ ( g ) and PH 3 ​ ( g ) are 140 and 8 KJ mol − 1 respectively and heat of atomization of phosphorous P 4 ​ ( s ) , chlorine and hydrogen are 320 , 120 & 216 K J m o l − 1 respectively then, find which of the following is/are correct statement(s).

TestHub · Accepted Answer

4 1 ​ P 4 ​ ( s ) + 2 3 ​ Cl 2 ​ ( g ) ⟶ PCl 3 ​ ( g ) ; Δ H = 140 140 = ( 4 1 ​ × 320 + 2 3 ​ × 120 ) − 3 × ( B − E ) P − C I ​ ; ( B − E ) P − Cl ​ = 3 120 ​ = 40 kJ / mole 4 1 ​ P 4 ​ ( s ) + 2 3 ​ H 2 ​ ( g ) ⟶ PH 3 ​ ( g ) ; Δ H = 8 8 = ( 4 1 ​ × 320 + 2 3 ​ × 216 ) − 3 × ( B − E ) P − H ​ ; ( B − E ) P − H ​ = 132 kJ / mole H 2 ​ → 2 H ; Δ H = 216 ∴ ( Δ H f ​ ) H ​ = 2 216 ​ = 108 kJ / mole Cl 2 ​ → 2 Cl ; Δ H = 120 ∴ ( Δ H f ​ ) Cl ​ = 2 120 ​ = 60 kJ / mole

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