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This quiz contains 12 questions from a mix of 1 subtopics.
Phosphorus reacts with oxygen to give a compound that is 43.7% phosphorus and 56.3% oxygen.
What is the empirical formula of the compound?
PO
P2O5
P1O2.5
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What is the empirical formula of a compound that contains 15.9% boron and 84.1% fluorine?
B3F
BF3
B2F3
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What is the empirical formula of a compound that contains 46.3% lithium and 53.7% oxygen?
Li2O2
Li2O
Li2O4
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Compound X has the following percentage by mass composition: C: 40.0%; H: 6.7%; O: 53.3%.
Deduce the empirical formula of compound X.
C2H4O
CH2O
CHO
C6HO8
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Compound X has an empirical formula of CH2O and a relative molecular mass of 180.0.
Deduce the molecular formula of compound X.
C6H12O6
6(CH2O)
C6H6O6
C12H12O12
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Compound Y contains 52.2 g of carbon, 13.0 g of hydrogen and 34.8 g of oxygen.
Deduce the empirical formula of compound Y.
CH3O
C2H6O
C3H6O2
C2H3O
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Select the correct formula for hydrated copper(II) sulfate.
CuSO4•5H2O
CuSO4 + 5H2O
CuSO4
CuSO45H2O
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Select the correct formula for anhydrous cobalt(II) chloride.
CoCl2
Co2Cl2•2H2O
Co2Cl2
CoCl2•2H2O
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A 1.20 g sample of hydrated tin chloride is heated, causing it to decompose and form 1.01 g of anhydrous tin chloride:
SnCl2•nH2O ➔ SnCl2 + nH2O
Work out the value of n.
The formula of the hydrated compound is SnCl2•H2O
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3.74 g of hydrated copper sulfate is heated to form 2.39 g of anhydrous copper sulfate:
CuSO4•nH2O ➔ CuSO4 + nH2O
Work out the value of n.
The formula of the hydrated compound is CuSO4•H2O
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4.92 g of hydrated magnesium sulfate was heated to remove the water, producing 2.40 g of anhydrous magnesium sulfate.
Work out the value of n.
The formula of the hydrated compound is MgSO4•H2O
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A 4.31 g sample of hydrated Na2CO3 is heated to remove the water. The mass of the resulting anhydrous compound is 3.22 g.
What is the formula of the hydrated compound?
The formula of the hydrated compound is Na2CO3•H2O
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