Q 1:Calculate Δ H for the synthesis of diborane(B2H6) from its elements, according to the equation:
2B(s) + 3 H2(g) → B2H6(g) using the following data:
(1) 2B(s) + 3/2O2(g) → B2O3(s); ΔH(1)= -1273 kJ;
(2) B2H6(g)+ 3 O2(g) → B2O3(s)+ 3H2O(g); Δ H(2)= -2035 kJ;
(3) H2(g) + ½ O2(g) → H2O(g); Δ H(3)= -242 kJ
Q 2:Calculate Δ H for the equation:
C(s)+ H2O(g) → CO(g)+ H2(g) using the following data:
C(s)+ O2(g) → CO2(g) ∆H = -393,5 kJ
2CO(g)+ O2(g) → 2CO2(g) ∆H = -566,0 kJ
2 H2(g)+ O2(g) → 2H2O(g) ∆H = -571,6 kJ
Q 3:Burning 1.00 g of sucrose (C12H22O11) is found to raise the temperature of the calorimeter by 2.35 oC.If the overall heat capacity of the calorimeter is 7.12 kJ/oC, calculate the molar enthalpy of combustion for sucrose.
C12H22O11(s) + 12 O2(g) → 12CO2(g) + 11H2O(g)
Q 4:Consider the reaction: 2HI(g) <=> H2(g) + I2(g)
in a 5 L flask.
If a reaction mixture initially contains 4 mol HI và0.442 mol I2. At equilibrium, the flask contains 1mol I2.
What are the equilibrium concentrations of HI, H2, I2?
a) Calculate KC, KP.
b) At equilibrium, adding 0.1mol HI to the flask. What are the new equilibrium concentrations of HI, H2, I2?
c) Compressing the gases, how will the following changes affect the equilibrium?
Q 5:
5.1. For the reaction 3H2(g) + N2(g) <=> 2NH3(g) ∆H < 0, the best set of conditions to produce more product are:
A. high temperature and low pressure
B. low temperature and high pressure
C. low temperature and low pressure
D. high temperature and high pressure
5.2.Consider the following constant expression: Keq= [CO2]. Which one of the following equilibrium systems does the above expression represent?
A. CO2(g) <=> CO2(s)
B. PbO(s) + CO2(g) <=> PbCO3(s)
C. CaCO3(s) <=> CaO(s) + CO2(g)
D. H2CO3(aq) <=> H2O(l) + CO2(aq)
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