The heats of combustion of rhombic and monocl | vedclass

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Question

(D) The combustion reactions are given as follows:$S_{	ext{(rhombic)}} + O_2 	o SO_2$,$\Delta H_1 = -70960 \ cal$ ... $(I)$$S_{	ext{(monoclinic)}}

Vedclass · Accepted Answer

$+70$

Vedclass · Answer

(D) The combustion reactions are given as follows:$S_{	ext{(rhombic)}} + O_2 	o SO_2$,$\Delta H_1 = -70960 \ cal$ ... $(I)$$S_{	ext{(monoclinic)}} + O_2 	o SO_2$,$\Delta H_2 = -71030 \ cal$ ... $(II)$To find the heat of conversion for $S_{	ext{(rhombic)}} 	o S_{	ext{(monoclinic)}}$,we subtract equation $(II)$ from equation $(I)$:$S_{	ext{(rhombic)}} - S_{	ext{(monoclinic)}} = -70960 - (-71030)$$S_{	ext{(rhombic)}} 	o S_{	ext{(monoclinic)}}$,$\Delta H = -70960 + 71030 = +70 \ cal$Thus,the heat of conversion is $+70 \ cal$.

Molecule	$\Delta_f H^0 (kJ \ mol^{-1})$
$C_2H_5OH_{(l)}$	$-280$
$CO_{2(g)}$	$-400$
$H_2O_{(l)}$	$-290$

The heats of combustion of rhombic and monoclinic sulphur are respectively $70960 \ cal$ and $71030 \ cal$. What will be the heat of conversion of rhombic sulphur to monoclinic? $(cal)$

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