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When 1.3584 g of sodium acetate trihydrate was mixed into 100.0 cm3 of 0.2000 m HCl(aq) at 25°C in a solution calorimeter, its temperature fell by 0.397°C on account of the reaction:
H3O+(aq) + NaCH3CO2 · 3 H2O(s)
→Na+(aq) + CH3COOH(aq) + 4 H2O(l).
The heat capacity of the calorimeter is 91.0 J K-1 and the heat capacity density of the acid solution is 4.144 J K-1 cm-3. Determine the standard enthalpy of formation of the aqueous sodium cation. The standard enthalpy of formation of sodium acetate trihydrate is -1064 kJ mol-1.
a sample of air contains 78.08% nitrogen, 20.94% oxygen, .05%carbon dioxide and .930% argon by volume. How many molecules of each gas are present in 1 liter of the sample at 25 degrees celsius and 1 atmosphere?
The frequency of vibration in a quartz watch is 33 kHz. What is the energy required to excite this vibration? Also compute omega for this vibration.
Derived from common sense is the same as the one derived mathematically from the equation obtained in the experiment.
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