Question #49936

Question 1:

A compound A reacts according to the following hypothetical equation and has a molecular weight of 48.36 g/mol.

3 A (s) +B (aq) â€“â€“> 2 C (aq) âˆ†HÂ° = ?

A sample of A, weighing 0.152 g reacts in a flask containing 250.00 g of water and the water temperature increases from 24.85 Â°C to a temperature of 26.26 Â°C. Calculate âˆ†HÂ° for the reaction as written in the equation.

Answer: -1408 kJ

Question 2:

For which of the following reactions is âˆ†HÂ° = âˆ†HÂ°f, the heat of formation?

i. C (s) + 2 F2(g) â€“â€“> CF4 (g) âˆ†HÂ° = â€“ 221.0 kJ

ii. H(g) + Br (g) â€“â€“> HBr (g) âˆ†HÂ° = â€“366.2 kJ

iii. 2 C(s) + H2(g) + 3 Cl2(g) â€“â€“> 2 CHCl3 (g) âˆ†HÂ° = â€“268.2

Could you also explain exactly what Delta H means.

A compound A reacts according to the following hypothetical equation and has a molecular weight of 48.36 g/mol.

3 A (s) +B (aq) â€“â€“> 2 C (aq) âˆ†HÂ° = ?

A sample of A, weighing 0.152 g reacts in a flask containing 250.00 g of water and the water temperature increases from 24.85 Â°C to a temperature of 26.26 Â°C. Calculate âˆ†HÂ° for the reaction as written in the equation.

Answer: -1408 kJ

Question 2:

For which of the following reactions is âˆ†HÂ° = âˆ†HÂ°f, the heat of formation?

i. C (s) + 2 F2(g) â€“â€“> CF4 (g) âˆ†HÂ° = â€“ 221.0 kJ

ii. H(g) + Br (g) â€“â€“> HBr (g) âˆ†HÂ° = â€“366.2 kJ

iii. 2 C(s) + H2(g) + 3 Cl2(g) â€“â€“> 2 CHCl3 (g) âˆ†HÂ° = â€“268.2

Could you also explain exactly what Delta H means.

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