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Earned Point(s): 0 of 0, (0) What is the empirical formula of an oxide of iron, formed by reacting \(2.24 \mathrm{~g}\) of iron with \(0.96 \mathrm{~g}\) of oxygen?
An experiment was done to determine the formula of a hydrocarbon, \(\mathrm{C}_{\mathrm{x}} \mathrm{H}_{\mathrm{y}}\).
A compound contains \(34.5 \%\) calcium, \(24.1 \%\) silicon and \(41.4 \%\) oxygen by mass.
The relative molecular mass of an alcohol is 88 . \[
Benzene is a liquid with molecular formula \(\mathrm{C}_6 \mathrm{H}_6\).
Analysis of a compound formed between magnesium and nitrogen showed it contained \(14.4 \mathrm{~g}\) of magnesium and \(5.6 \mathrm{~g}\) of nitrogen.
In athletics, banned drugs such as nandrolone have been taken illegally to improve performance. Nandrolone has the molecular formula \(\mathrm{C}_{18} \mathrm{H}_{26} \mathrm{O}_2\).
What is the relative molecular mass, \(M_r\), of nitrogen dioxide?
The diagram shows an experiment to find the formula of magnesium oxide.
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1. Question
1 point(s)
2. Question
1 point(s)
\(10 \mathrm{~cm}^3\) of the gaseous hydrocarbon, \(\mathrm{C}_x \mathrm{H}_y\), was burned in an excess of oxygen to form \(20 \mathrm{~cm}^3\) of carbon dioxide and \(30 \mathrm{~cm}^3\) of water vapour.
What is \(\mathrm{C}_{\mathrm{x}} \mathrm{H}_{\mathrm{y}}\) ?
3. Question
1 point(s)
What is its empirical formula?
4. Question
1 point(s)
Its percentage composition by mass is: \(\mathrm{C}, 54.5 \% ; \mathrm{H}, 9.1 \% ; \mathrm{O}, 36.4 \%\).
Which row shows the empirical formula and molecular formula for this alcohol?
\begin{array}{|c|c|c|}
\hline & \text { empirical formula } & \text { molecular formula } \\
\hline \text { A } & \mathrm{C}_2 \mathrm{H}_4 \mathrm{O} & \mathrm{C}_2 \mathrm{H}_4 \mathrm{O} \\
\text { B } & \mathrm{C}_2 \mathrm{H}_4 \mathrm{O} & \mathrm{C}_4 \mathrm{H}_8 \mathrm{O}_2 \\
\text { C } & \mathrm{C}_4 \mathrm{H}_8 \mathrm{O}_2 & \mathrm{C}_4 \mathrm{H}_8 \mathrm{O}_2 \\
\text { D } & \mathrm{C}_4 \mathrm{H}_8 \mathrm{O}_2 & \mathrm{C}_2 \mathrm{H}_4 \mathrm{O} \\
\hline
\end{array}
\]
5. Question
1 point(s)
Ethene is a gas with molecular formula \(\mathrm{C}_2 \mathrm{H}_4\).
Which statement is correct?
6. Question
1 point(s)
What is the empirical formula of the compound?
7. Question
1 point(s)
What is the relative molecular mass, \(M_r\), of nandrolone?
(Relative atomic mass: \(\mathrm{H}=1 ; \mathrm{C}=12 ; \mathrm{O}=16\) )
8. Question
1 point(s)
9. Question
1 point(s)
Which piece of apparatus would be needed in addition to those shown?
Chemical Formulae