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WorksheetsEmpirical and Molecular Formula
Total questions: 18
Worksheet time: 29mins
2.40 g of an explosive, J, contains 0.473 g of nitrogen. J also contains 33.8% carbon and 1.41% hydrogen by mass. The remainder of J is oxygen.
What is the empirical formula of J?
C4HNO2
CH2N2O
C2HNO2
CHNO
Phenyl magnesium bromide is used as a reagent in organic synthesis. Determine its molecular formula if its molar mass is 181.31 g/mol and it contains 39.75% C, 2.78% H, 13.41% Mg, and 44.07% Br (these are in the correct order).
C12H10Mg2Br2
CHMgBr
C6H5MgBr
C3H2.5MgBr
What is the molecular formula for a compound with the empirical formula: CaCl2 and a molecular mass of 220g.
Ca2Cl4
Ca3Cl6
Ca3Cl9
Ca3Cl5
An unknown compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. It has a molecular mass of 60.0 g/mol. Calculate its molecular formula.
(a)
A hydrocarbon contains 85.7% carbon with a molecular mass of 84.0 g/mol. Calculate its molecular formula.
(a)
A piece of iron ore contains 72.3% iron and 27.7% oxygen with a molecular mass of 231.4 g/mol. Calculate its molecular formula.
(a)
A compound contains 87.4% nitrogen. The remainder is hydrogen. If the molecular mass is 32 g/mol, what is its molecular formula?
(a)
A compound with a molar mass of 74 g/mol contains 64.8% carbon and 13.5% hydrogen. When it was burned it produced carbon dioxide and water. Calculate its molecular formula.
(a)
A compound contains 24.8% carbon, 2.0% hydrogen and 73.2% chlorine. It has a molar mass of 96 g/mol. Calculate its molecular formula.
(a)
An oxide of nitrogen contains 46.7% nitrogen and has a molecular mass of 60 g/mol. What's its molecular formula?
(a)
A gas sample contained the elements carbon, hydrogen, oxygen, phosphorus and fluorine in the respective quantities: 39.10%, 7.67%, 26.11%, 16.82% and 10.30%. It has a molecular mass of 184 g/mol. What is the molecular formula for this compound?
(a)
