Chemistry-
General
Easy
Question
IfH2(g)+Cl2(g)→2HCl(g);ΔH°=–44Kcal 2Na(s)+2HCl(g)→2NaCl(s)+H2(g);ΔH=–152KcalThe,Na(s)+0.5Cl(g)→NaCl(s);ΔH°=?
- 108Kcal
- 196Kcal
- –98Kcal
- 54Kcal
The correct answer is: –98Kcal
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Fromthefollowingdata,theheatofformationof Ca(OH)2(s) at18°Cis......Kcal.
i)CaO(s)+HO(
)=Ca(OH)(s);ΔH18°C=–15.26Kcal....
ii)H2O()=H2(g)+1/2O2(g)ΔH18°C=68.37Kcal......
iii)Ca(s)+1/2O2(g)=CaO(s)ΔH18°C=–151.80Kcal...
Fromthefollowingdata,theheatofformationof Ca(OH)2(s) at18°Cis......Kcal.
i)CaO(s)+HO()=Ca(OH)(s);ΔH18°C=–15.26Kcal....
ii)H2O()=H2(g)+1/2O2(g)ΔH18°C=68.37Kcal......
iii)Ca(s)+1/2O2(g)=CaO(s)ΔH18°C=–151.80Kcal...
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