At what standard conditions does the heat of combustion calculated?
a) 26°C, 1 atm
b) 25°C, 0.5 atm
c) 25°C, 1 atm
d) 26°C, 0.5 atm
Q.2.
Hydrogen peroxide decomposes according to the following thermochemical reaction:
a) -2.89 kJ
b) -2.80 kJ
c) -2.00 kJ
d) -2.85 kJ
Q.3.
Calculate ΔH if a piece of metal with a specific heat of 0.kJ-kg-1-K-1 and a mass of 2kg is heated from 22°C to 28°C.
a) 11.66 kg
b) 11.56 kg
c) 11.76 kg
d) 11.26 kg
Q.4.
If a calorimeter’s ΔH is +Joules, how much heat did the substance inside the cup lose?
a) +2000 J
b) – 2001 J
c) – 2000J
d) + 2001 J
Q.5.
Calculate the ΔH of the following reaction: CO2(g) + H2(g)O -> H2CO3(g) if the standard values of ΔHf are as follows: CO2(g) : -393.KJ/mol, H2O(g): – 241.KJ/mol, and H2CO3(g) : – 275.2 KJ/mol.
a) +360.139 KJ
b) +350.129 KJ
c) – 360.139 KJ
d) -350.129 KJ
Q.6.
Calculate ΔH if a piece of aluminum with a specific heat of 0.9 kJ-kg-1-K-1 and a mass of 1.6 kg is heated from 286°K to 299°K.
a) 16.52 kJ
b) 17.72 kJ
c) 18.72 kJ
d) 15.52 kJ
Q.7.
Calculate the ΔH value of the reaction:
a) 141.8
b) 121.8
c) 131.8
d) 151.8
Q.8.
Calculate ΔH for the reaction:
a) 867
b) 895
c) 847
d) 875
Q.9.
Consider the reaction:
a) 96.80 kJ
b) 95.30 kJ
c) 96.50 kJ
d) 95.50 kJ
Q.10.
Refer to Q9 and answer what is the enthalpy change for the reaction of 100.0 g of nitrogen with excess oxygen?
a) 1164 kJ
b) 1190 kJ
c) 1194 kJ
d) 1160 kJ
Q.11.
2SO2(g) + O2(g) → 2 SO3(g)
a) 1435 kJ
b) 1343 kJ
c) 1345 kJ
d) 1433 kJ
Q.12.
Calculate the work done in the following reaction when 2 mol of NH4NO3 decomposes at constant pressure at°C. State whether work is on the system or by the system.
a) – 18.61 kJ
b) – 18.86 kJ
c) – 18.65 kJ
d) – 18.85 kJ
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