Question
Distinguish between a sigma and a pi bond.

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i. When 20.0 g of ammonium nitrate $\left( NH _4 NO _3\right)$ is dissolved in 125 g of water in a coffee cup calorimeter, the temperature falls from 296.5 K to 286.4 K . Find the value of q for the calorimeter. (Treat heat capacity of water as the heat capacity of the calorimeter and its contents).
ii. A chemist while studying the properties of gaseous $CCl _2 F_2$, a chlorofluorocarbon refrigerant, cooled a 1.25 g sample at constant atmospheric pressure of 1.0atm from 320 K to 293 K . During cooling, the sample volume decreased from 274 to 248 mL . Calculate $\Delta H$ and $\Delta U$ for the chlorofluorocarbon for this process. For $CCl _2 F_2$, $C_p=80.7 J /( mol K )$.
S. No
Column I
Column II
1.
$Cl_2O$
+7
2.
$Cl_2O_7$
+4
3.
$ClO_2$
+1
4.
$Cl_2O_6$
+6
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