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WorksheetsSTOICHIOMETRY IGCSE
Total questions: 10
Worksheet time: 18mins
Calcium phosphate contains phosphate ion, PO43-.
What is the formula for calcium phosphate?
(You do not need to subscript the numbers)
(a)
An oxide of nitrogen has the following composition by mass: N, 30.4%; O, 69.6%.
It has a relative molecular mass of 92.
What is the molecular formula of the oxide of nitrogen?
(Ar N=14, O=16)
N2O3
NO2
N2O4
NO
Propane burns in oxygen.
C3H8 + xO2 → 3CO2 + yH2O
Which values of x and y balance the equation?
x = 4, y = 5
x = 5, y = 4
x = 2, y = 4
x = 3, y = 4
The relative formula mass, Mr, of calcium carbonate, CaCO3, is 100.
Ar Ca=40, C=12, O=16.
What is the mass of carbon present in 100 g of calcium carbonate?
(a)
Phosphorus forms another compound with hydrogen with the following composition by mass:
P: 93.94%, H: 6.06%
Calculate the empirical formula of the compound. (Ar P=31, H=1)
(You do not need to subscript the numbers)
(a)
The compound magnesium nitrate has the formula Mg(NO3)2.
What is the relative formula mass of magnesium nitrate?
(Ar Mg=24, N=14, O=16)
(a)
Which statements are correct?
(Ar Ca=40, C=12, O=16, H=1, Cl=35.5)
1 and 2
2 and 4
1 and 3
2 and 3
A
B
C
D
A
B
C
D
A
B
C
D
