Question

A chemist measures the enthalpy change AH during the following reaction: 8 SO2(9) 16 H2S(g) AH=-1863. kJ 3 Sg(s) + 16 H,20) Use this information to complete the table below. Round each of your answers to the nearest kJ/mol. AH Oto reaction E726. kJ 16S0, (8) +32H,S () -- 6s,) +32H20 () 1863. kJ 3s,() +16H,O()8So, (e)16H,s() 5589. kJ 9s,()48H,0()24SO, (s) +48H,S (g)

Answer 1

Hi,

Hope you are doing well.

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PART 1:

Given reaction:

8502 + 16H Sq) +358(s) + 16H,00

For this reaction,

ᎪᎻ =-1863 kᎫ

Required reaction:

16502 +32H25(q) + 658(s) + 32H,00

We can see that all reaction coefficients doubled.

Hence the enthalpy change of the reaction will also get's doubled.

... ΔΗ = 2x ΔΗ = 2x –1863 kJ

.:. ΔΗ = -3726 kJ

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PART 2:

Given reaction:

8502 + 16H Sq) +358(s) + 16H,00

For this reaction,

ᎪᎻ =-1863 kᎫ

Required reaction:

358(s) + 16H00) +8502 + 16H259)

We can see that all reaction coefficients are tripled.

Hence the enthalpy change of the reaction will also get's tripled.

... ΔΗ =-ΔΗ =-(-1863 kJ)

.:. ΔΗ = +1863 kJ

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PART 3:

From PART 3, we have the reaction:

358(s) + 16H00) +8502 + 16H259)

For this reaction,

ΔΗ = +1863 kJ

Required reaction:

9.58(s) + 48H200) +24502 +48H259)

We can see that the reaction has reversed.

Hence the enthalpy change of the reaction will also get's reversed, that is it's negative.

... ΔΗ3 = 3Χ ΔΗ = 2x +1863 kJ

.:. ΔΗ = +3726 kg

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