# Question 4.4: The enthalpy of solution for the reaction Na2SO4(s)→2 Na^+(a...

The enthalpy of solution for the reaction

$Na_{2}SO_{4}\left( s \right)\overset{H_{2}O\left( l \right)}{\longrightarrow } 2 Na^{+}\left( aq \right)+SO^{2-}_{4}\left( aq \right)$

is determined in a constant pressure calorimeter. The calorimeter constant was determined to be $342.5 J K^{-1}$.When 1.423 g of $Na_{2}SO_{4}$ is dissolved in 100.34 g of $H_{2}O\left( l \right),\Delta T=0.031 K$. Calculate $\Delta H°_{solution}$ for $Na_{2}SO_{4}$ from these data. Compare your result with that calculated using the standard enthalpies of formation in Table 4.1 (Appendix A, Data Tables) and in Chapter 10 in Table 10.1.

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Question: 4.1

## The average bond enthalpy of the O—H bond in water is defined as one-half of the enthalpy change for the reaction H2O(g)→2 H(g) +O(g) The formation enthalpies, ΔH°ƒ,for H(g) and O(g) are 218.0 and 249.2 KJ mol-¹, respectively, at 298.15 K, and ΔH°ƒ for H2O(g) is -241.8 KJ mol-¹ at the same ...

a. We consider the sequence \begin{array}{r...
Question: 4.3

## When 0.972 g of cyclohexane undergoes complete combustion in a bomb calorimeter, ΔH of the inner water bath is 2.98°C. For cyclohexane, ΔUcombustion is –3913 kJ mol-¹. Given this result, what is the value for ΔUcombustion for the combustion of benzene if ΔT is 2.36°C when 0.857 g of benzene ...

\Delta H°_{R,1450 K}=\Delta H°_{R,298.15 k}...