Problem 2. Using the enthalpy of reaction. The next six questions are part of problem 2. Please refer back to this problem statement if you need to refresh your memory. How much did our sodium-in-water demonstration raise the temperature of water in the dessicator jar? The reaction we performed was: Na(s) + H2O(l) →→ NaOH(aq) + 1/2H2(g) qreaction = ΔΔrHo = -184 kJ/mol-rxn Assuming the dessicator jar is well insulated (like our coffee-cup calorimeter), the energy balance is: 0 = qsystem = qreaction + qwater ⇒⇒ qreaction = -qwater qreaction = -mwater*Cwater*ΔΔTwater The data from the demonstration was: (a) 1.0 kg water, (b) 22.0oC, (d) Cwater = 4.18 J/g-K, (e) mNa = 0.21 g What is the molar mass of sodium, Na, in g/mol?
Problem 2. Using the enthalpy of reaction.
The next six questions are part of problem 2. Please refer back to this problem statement if you need to refresh your memory.
How much did our sodium-in-water demonstration raise the temperature of water in the dessicator jar? The reaction we performed was:
Na(s) + H2O(l) →→ NaOH(aq) + 1/2H2(g) qreaction = ΔΔrHo = -184 kJ/mol-rxn
Assuming the dessicator jar is well insulated (like our coffee-cup calorimeter), the energy balance is:
0 = qsystem = qreaction + qwater ⇒⇒ qreaction = -qwater
qreaction = -mwater*Cwater*ΔΔTwater
The data from the demonstration was: (a) 1.0 kg water, (b) 22.0oC, (d) Cwater = 4.18 J/g-K, (e) mNa = 0.21 g
What is the molar mass of sodium, Na, in g/mol?
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