Question
The equation for the reaction between aqueous lead(II) nitrate and aqueous sodium chloride is shown.
Pb(NO3)2(aq) + 2NaCl(aq) → PbCl2(s) + 2NaNO3(aq)
If 100 cm3 of aqueous lead(II) nitrate of concentration 0.1 mol / dm3 is reacted with an excess of aqueous sodium chloride, which mass of lead(II) chloride is obtained?
A 1.16 g B 2.42 g C 2.78 g D 3.31 g
Answer/Explanation
Ans:
C
Question
The equation for the reaction of iron(III) oxide with carbon monoxide is shown.
\(Fe_2O_3(s) + 3CO(g) → 2Fe(s) + 3CO_2(g)\)
What is the maximum mass of iron that can be made from 480 g of iron(III) oxide?
A 56 g B 112 g C 168 g D 336 g
Answer/Explanation
Ans: D
Question
A tablet contains 0.080 g of ascorbic acid (\(M_{r}\) = 176). What is the concentration of ascorbic acid when one tablet is dissolved in 200 cm3 of water?
A. 9.1 × \(10^{-5}\) mol / \(dm^{3}\)
B. 4.5 × \(10^{-4}\) mol / \(dm^{3}\)
C. 9.1 × \(10^{-2}\) mol / \(dm^{3}\)
D. 2.3 × \(10^{-3}\) mol / \(dm^{3}\)
Answer/Explanation
Ans:
D
Question
The equation for the decomposition of magnesium nitrate is shown.
\(2Mg(NO_3)_2(s) → 2MgO(s) + 4NO_2(g) + O_2(g)\)
Which volume of gas is produced when 0.1 moles of magnesium nitrate is decomposed completely?
A 1.2 \(dm^3\) B 4.8 \(dm^3\) C 6.0 \(dm^3\) D 8.4 \(dm^3\)
Answer/Explanation
Ans: C