ZAPEN & INORGANIC NOMENCLATURE
BALANCE BY SCORE AND REDOX
ENTALPY, ENTROPY AND GIBSS ENERGY
PH & CONCENTRATION
Gases law
100
What is Z, and A iron?
26 and 56
100
SF4 + H2O SO2 + 2HF
1-S-1
4-F-1-4
4-2-H-1-4
2-1-O-2
100
How much heat is produced by combustion of 125 g of methanol (CH3OH) under standard state conditions?
Answer: 2836.3 kJ
100
Calculate the ph
The H + concentration in a bottle of 4 x 10^-3M
Ph = 2.3979
100
A gas has a volume of 3L at a temperature of 40ºC. At what temperature will the gas have a volume of 1.25L?
T2=20°C
200
What is ZAPEN of aluminium?
13 27 13 13 14
200
.Determine the oxidation number of the elements in each of the following compounds:
b. N2
c. Zn(OH)42-
N: 0
Zn: 2+, H: +1, O: -2
200
When 2.50 g of methane burns in oxygen, it produces 125 kJ of heat. What is the enthalpy of combustion per mole of methane under these conditions?
802 kJ mol−1
200
Calculate the ph
The OH- concentration on a substance is 6.309 x 10^-6
Ph=13.99
200
A sample gas occupies a volume of 2L at 35ºC and pressures of 0.5atm, what volume will the sample occupy at 1atm and 0ºC?
V2= .885L
300
Write zapen and the electronic configuration of vanadium?
23 51 23 23 28 1S2 2S2 2P6 3S2 3P6 4S2 3D10
300
PH3 + N2O RXN 4O10 + H2O + -N2
4-1-P-4
12-3-H-2-12
32-2-N-2-32
16-1-O-16
300
If I know that the change in entropy of a system where heat was added is 20 J/K, and that the temperature of the system is 300 K, what is the amount of heat added to the system?
6000 J
300
Calculate the concentration
The ph of a restaurant drink is 2.25
0.0056 H+
300
How many moles of a gas are present in .300L measured at 10ºC and 30.34atm?
N=3.866 mol
400
Write the formula of potassium permanganate?
KMnO4
400
H3PO4 + 12(NH4)2MoO4 + 21HNO3 (NH4)3PO4*12MoO3 + 21NH4NO3 +
12H2O
24-4-H-2-24
1-PO4-1
24-2-NH4-4-24
12-1-Mo-12
48-4-O-4-10-48
21-1-NO3-1-21
400
Predict whether the following reaction is still spontaneous at 500 ºC:
N2(g) + 3 H2(g) → 2 NH3(g)
Assume that
400
Calculate the percentage of HF ionization in each the following concentration: you have a 0.1 M
= 3.16 %
400
What is the pressure in atm of 8.21mol of a gas in a 31.5L cylinder at 27ºC?
P= .64atm
500
Which compound is Ga2(SO4)3?
Gallium Sulfite
500
5.Write balanced equations for the following reactions:
a. Cr(OH)3 + Br2 
10 OH- + 2 Cr(OH)3 + 3 Br2 
500
Use the value of
K = e13.3 = 6.0 x105
500
If the pH of an aqueous solution of 0.15 M HF is 2, what is the percent ionization of HF?
6.6% dissociated
500
A gas has 457mL at a temperature of 20ºC and a pressure of 91.7kPa. The next day the same sample occupies 280mL at a temperature of 10ºC . What is the new pressure of the gas?
P2= 144.56kPa