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Heat of Reaction

What amount o...

Question

What amount of heat (in kJ) is released in forming 31.2g of $A s H_{3}$ by the following reaction ?
(Given : At. wt. As = 75, H = 1)
Given : $2 A s (s) + 3 H 2 (g) \to 2 A s H 3 (g)$ ; $Δ H = - 780 k J$

312

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390

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156

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780

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Solution

The correct option is C 156
Moles of $A s H_{3} = \frac{31.2}{78} = 0.4$
$A s H_{3} = \frac{780}{2} \times 0.4 = 156 K J$

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Similar questions

(A s H_{3})

2 A s H_{3} (g) ⟶ 2 A s (s) + 3 H_{2} (g)

$t$ $(m i n)$	$0$	$5$	$7.5$	$10$
$p (m m$ $H g)$	$760$	$836$	$866.4$	$896.8$

(A s H_{3})

2 A s H_{3} (g) \to 2 A s (s) + 3 H_{2} (g)

$t (m i n)$	0	5	7.5	10
$P_{t} (m m H g)$	760	836	866	897

l o g (1.25) = 0.096 l o g (1.38 = 0.142 l o g (1.56) = 0.194

(A s H_{3})

2 A s H_{3} (g) \to 2 A s (s) + 3 H_{2} (g)

$t (m i n)$	0	5	7.5	10
$P_{t} (m m H g)$	760	836	866	897

l o g (1.25) = 0.096 l o g (1.38 = 0.142 l o g (1.56) = 0.194

P b O

438 k J

22.3 g P b O (s)

P b = 207, O = 16.0)

2 P b (s) + O_{2} (g) \to 2 P b O (s)

C_{3} H_{4}

C_{3} H_{4} (g) + 4 O_{2} (g) \to 3 C O_{2} (g) + 2 H_{2} O (l)

Δ H^{\circ} = - 1939.1 k J

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