The heat evolved in combustion of rhombic sulphur and monoclinic sulphur are respectively

Question

The heat evolved in combustion of rhombic sulphur $(S_{R})$ and monoclinic sulphur $(S_{M})$ are respectively, 70960 and 71030 cal/mol. What will be heat of conversion of rhombic sulphur to monoclinic sulphur.

Smart Achievers · Accepted Answer

(4)

$S_{R} + O_{2} ⟶ S O_{2} Δ H_{1} = - 70960 C a l_____(i)$

$S_{M} + O_{2} ⟶ S O_{2} Δ H_{2} = - 71030 C a l_____(i i)$

$Subtracting eqn (II) from (i) we get,$

$Δ H = Δ H_{1} - Δ H_{2} = (- 70960) - (- 71030) = + 70 C a l$

Solution

Q.
The heat evolved in combustion of rhombic sulphur $(S_{R})$ and monoclinic sulphur $(S_{M})$ are respectively, 70960 and 71030 cal/mol. What will be heat of conversion of rhombic sulphur to monoclinic sulphur.

1 70960 cal

2 71030 Cal

3 -70

4 +70

Ans.
(4)

$S_{R} + O_{2} ⟶ S O_{2} Δ H_{1} = - 70960 C a l_____(i)$

$S_{M} + O_{2} ⟶ S O_{2} Δ H_{2} = - 71030 C a l_____(i i)$

$Subtracting eqn (II) from (i) we get,$

$Δ H = Δ H_{1} - Δ H_{2} = (- 70960) - (- 71030) = + 70 C a l$

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