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(a) Diborane (B2H6) is a highly reactive borohydride that can be used as rocket fuel. Calculate Δ? for synthesis from th...

(a) Diborane (B2H6) is a highly reactive borohydride that can be used as rocket fuel. Calculate Δ? for synthesis from the elements as:

2B (s) + 3H2 (g) → B2H6 (g)

Use the following data:

4B (s) + 3O2 (g) → 2B2O. (S) Δ? = -2546 kJ mol-1

B2H6 (g) + 3O2 (g) → B2O3 (s) + 3H2O (g) Δ? = -2035 kJ mol-1

2H2 (g) + O2 (g) → 2H2O (l) Δ? = -572 kJ mol-1

H2O (l) → H2O (g) Δ? = 44 kJ mol-1

(b) Does the reaction increase or decrease entropy? Motivate your answer.

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Answer #1

Answer:-

This question is solved by using the simple concept of Hess law of constant heat transfer and using the definition of entropy.

The answer is given in the image,

Amauerca i. 4-8 ( 302 220315 AH-2546k 2 A2Ht 30249 A2031t3M20c-203k 3. 2M20)+02 2M20ui ohz-S12 kmof 20u 20 a- 44 Kmof e2Rraue

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