1.

What amount of heat ( in kJ) is released in forming 31.2 g AsH_(3) by the following reaction ? (Given : At. Wt. As=75, H=1) Given :2As(s) +3H_(2)(g) to 2AsH_(3)(g)""DeltaH=-780 kJ/mol

Answer»

SOLUTION :[0156]
Moles of `AsH_(3)=(31.2)/(78)=0.4`
HEAT liberated `=(780)/(2)xx0.4=056kJ`


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