Q.

What is standard enthalpy of reaction for the following reaction 12H2g+AgCls→Ags+H++Cl− given  ΔHfAgCl0=−30360calmol−1ΔHf0Cl−=−40020cal

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a

-8770 cal

b

-9660 cal

c

+9660 cal

d

+8770 cal

answer is B.

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Detailed Solution

ΔHr0=∑Hp0−∑HR0=ΔHf(Ag)0+ΔHf0+ΔHf(Cl-)0-12ΔHfH20+ΔHf(AgCl)0={0+0+(-40020)}-12(0)+(-30360)=-9660 cal
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What is standard enthalpy of reaction for the following reaction 12H2g+AgCls→Ags+H++Cl− given  ΔHfAgCl0=−30360calmol−1ΔHf0Cl−=−40020cal