ZAPEN, nomenclature of organics
Enthalpy, Entropy, Hess Law and free energy of Gibbs
Gases Law
Ph/acidity,strong and weak acids and weak acids and molar concentration
REDOX and normal balance
100
Write the formula of Bromic oxide
Br2O5
100
Calculate the entropy of formation taking in count the following reaction: 2 NO2(g)
N2O4(g). Using a standard-state enthalpy of formation and absolute entropy data table, we find the following information:
Compound S�(J/mol-K)
NO2(g) 240.06
N2O4 (g) 304.29
-175.83 J/K
100
What volume does 0.493mol of H2 gas occupy at 321.15 k and 2.35 atm?
5.53 L
100
If a solution of aspirin (acetylsalicylic acid ) has a [H30+]= 1.7 x 10-3M, . What is the Ph of the solution?
pH=2.77
100
Fe+ Cl2 −−→ FeCl3
2 Fe+3 Cl2 −−→ 2 FeCl3
200
Write the name of the molecule of Sn3(PO4)4 and CaSO4
Calcium sulfate and Stannic phosphate
200
Calculate the enthalpy of formation taking in count the following reaction: N2(g) + 3 H2(g)
2 NH3(g). Using a standard-state enthalpy of formation and absolute entropy data table, we find the following information:
Compound 
N2(g) 0
H2(g) 0
NH3(g) -46.11
-92.22 kJ
200
A sample of SO 2 gas has a volume of 13450 ml at a temperature of 73.4ºF. At what temperature will the gas have a volume of 2 L?
1.09 °F
200
What is the Ph of the blocker with [H30+]=4.2x10-12 M ?
Ph=11.38
200
Balance the following reaction:
C3H8+O2-->H2O+CO2
C3H8+5O2-->4H2O+3CO2
300
Write the formula of Silver Perchlorate and Nickelous Phospate
AgClO4 Ni3(Po4)2
300
Given the following information:
2NO(g) + O2(g) ---> 2NO2(g)
−116 kJ
2N2(g) + 5O2(g) + 2H2O(ℓ) ---> 4HNO3(aq)
−256 kJ
N2(g) + O2(g) ---> 2NO(g)
+183 kJ
Calculate the enthalpy change for the reaction below:
3NO2(g) + H2O(ℓ) ---> 2HNO3(aq) + NO(g)
−137 kJ
300
During a fire, the gases in an enclosure expand and can break the hermetic windows.
Assume that a room of 25m by 27m with a ceiling at 20m, which was at 4atm and 54 °C begins to burn. The temperature in the enclosure increases to 589 °C. What is the pressure exerted by hot air (still without changing volume)?
43.92 atm
300
Calculate the molarity of alcohol (C2H6O) if there are 179 grams and 800 grams of H20m.
4.86m
300
Balance the following reaction:
Ag + HNO3 → AgNO3 + NO2 + H2O
Ag + 2HNO3 → AgNO3 + NO2 + H2O
400
Calculate Z,A and electronic configuration of iron
Z:26 A:56 1s2 2s2 2p6 3s2 3p6 4s2 3d6
400
Calculate
H and
S for the following reaction:
NH4NO3(s) + H2O(l) 
Use the results of this calculation to determine the value of 
Compound 
NH4NO3(s) -365.56 151.08
NH4+ (aq) -132.51 113.4
NO3- (aq) -205.0 146.4
-4.4 kJ
400
550mL of chlorine under a pressure of 789 mm Hg are placed in a container under a
pressure of 1985 mm Hg. The temperature remains constant at 296 K. What is the volume of
the container in galons?
0.058 gal
400
Calculate the molarity of H2SO4 acid if there 3.5 grams and 120 grams of H2O.
0.291 m
400
H2 SiCl2 + H2O −−→ H8 Si4O4 + HCl
4 H2 SiCl2 +4 H2O −−→ 1 H8 Si4O4 +8 HCl
500
Write Zapen and electronic configuration of sodium
Z:11 A:23 p:11 n:12 e:11 1s2 2s2 2p6 3s1
500
Find the ΔH of the following reaction:
C(s, gr) + O2(g) ---> CO2(g)
With the following data:
SrO(s) + CO2(g) ---> SrCO3(s)
ΔH = −234 kJ
2SrO(s) ---> 2Sr(s) + O2(g)
ΔH = +1184 kJ
2SrCO3(s) ---> 2Sr(s) + 2C(s, gr) + 3O2(g)
ΔH = +2440 kJ
ΔH°f = -394 kJ
500
How many moles of a gas will a 4500mL flask hold at 48ºC and a pressure of 98.7kPa?
0.16m
500
Calculate the molarity of ethyl alcohol (C2H60) if you have 82.5 grams in volume of 0.5 liters.
3.98M
500
Balance the following reaction by Redox
I2+NaOH+Na2SO3-->NaI+Na2SO4
I2+2NaOH+Na2SO3-->2NaI+Na2SO4+H2O