Unit 1 - Formula and reaction quanitites
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What is the formula for Copper (II) Chloride
CuCl2
What is the fomulat for disulphur pentachloride
S2Cl5
Formula for Magnesium Sulfate
(finished in -ate) look page 8 Potassium Sulfate K SO4 1+ 2- 2 1 K2SO4
Formula for Ammonium phosphate
Ammonium phosphate NH4 PO4 1+ 3- 3 1 (NH4)3PO4
What is the charge of Iron in FeO
2+
What is the charge of Copper in Cu2CO3
1+
What is the name of MgS2O3
Magnesium thiosulfate (page 8 of databooklet)
Name of N3Br4
Trinitrogen tetrabromide
GFM of MgCl2
95.5
GFM of iron (IV) nitride
iron (IV) nitride Fe N 4 3 3 4 Fe3N4 (3x56)+(4x14) = 224
GFM of Oxygen
Oxygen is O2 and not O alone. Be careful with the diatomic molecules. So GFM of oxygen is : 16 x 2 = 32
What are the 7 diatomic elements?
H2 N2 F2 O2 I2 Cl2 Br2 Have No Fear Of Ice Cold Beer
Calculate the percentage composition of Iron in Fe2S
GFM= 144 Fe2 = 112 Percentage of Fe = (112/144) x100 = 77.78%
Ammonium nitrate, NH4NO3, has a gram formula mass of 80. Calculate the percentage by mass of nitrogen in ammonium nitrate
There is 2 nitrogen in NH4NO3 so mass of nitrogen = 14 x 2 = 28 pecentage by mass of nitrogen = (28/80) x100 = 35%
Calculate the concentration of a solution containing 20g of Magnesium in 200cm3 of water.
n= m/ GFM GFM of magnesium = 24.5 n= 20/24.5 = 0.82 mol C= n/V C= 0.82 / 0.2 C= 4.1 mol.l-1
Calculate the number of mole of Potassium in a 4g sample.
n=m/GFM n=4/24.5 n=0.16 mol