ESAT (Engineering and Science Admissions Test) · Chemistry

Quantitative chemistry

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What mass of calcium carbonate, $CaCO_{3}$ , is $0.25$ mol? ( $A_{r}$ : Ca $= 40$ , C $= 12$ , O $= 16$ .)
$5.85 g$ of sodium chloride ( $M_{r} = 58.5$ ) is dissolved to make $500 cm^{3}$ of solution. What is the concentration?
A compound contains $40.0%$ carbon, $6.7%$ hydrogen and $53.3%$ oxygen by mass. What is its empirical formula? ( $A_{r}$ : C $= 12$ , H $= 1$ , O $= 16$ .)
What is the atom economy for making calcium oxide by heating calcium carbonate: $CaCO_{3} \to CaO + CO_{2}$ ? ( $M_{r}$ : $CaCO_{3} = 100$ , $CaO = 56$ , $CO_{2} = 44$ .)
What is the percentage by mass of nitrogen in ammonium sulfate, $(NH_{4})_{2} SO_{4}$ ? ( $A_{r}$ : N $= 14$ , H $= 1$ , S $= 32$ , O $= 16$ .)
$20 cm^{3}$ of methane burns completely in oxygen: $CH_{4} + 2 O_{2} \to CO_{2} + 2 H_{2} O$ (steam). What volume of oxygen is needed, with all gases at the same tempera…
How many chloride ions are in $25 cm^{3}$ of $0.50 mol/dm^{3}$ calcium chloride solution? (Avogadro constant $= 6.0 \times 1 0^{23} mol^{- 1}$ .)
A current deposits copper from copper(II) sulfate solution: $Cu^{2 +} + 2 e^{-} \to Cu$ . How many moles of electrons are needed to deposit $0.10$ mol of copper?
$25.0 cm^{3}$ of acidified iron(II) solution needs $20.0 cm^{3}$ of $0.0200 mol/dm^{3}$ potassium manganate(VII) to reach the end point. The ionic equation uses…
$50.0 cm^{3}$ of $0.200 mol/dm^{3}$ silver nitrate is mixed with $50.0 cm^{3}$ of $0.150 mol/dm^{3}$ calcium chloride. What mass of silver chloride precipitates? ( $M_{r}$ AgCl…
What is the relative formula mass of calcium hydroxide, $Ca(OH)_{2}$ ? ( $A_{r}$ : Ca $= 40$ , O $= 16$ , H $= 1$ .)
$10.0 g$ of calcium carbonate reacts completely with excess hydrochloric acid: $CaCO_{3} + 2 HCl \to CaCl_{2} + H_{2} O + CO_{2}$ . What volume of carbon dioxide…
$25.0 cm^{3}$ of $0.100 mol/dm^{3}$ NaOH is neutralised by $20.0 cm^{3}$ of hydrochloric acid ( $NaOH + HCl \to NaCl + H_{2} O$ ). What is the concentrat…
$2.4 g$ of magnesium reacts with $100 cm^{3}$ of $1.0 mol/dm^{3}$ hydrochloric acid: $Mg + 2 HCl \to MgCl_{2} + H_{2}$ . What volume of hydrogen forms at RTP?…
$50 cm^{3}$ of a $2.0 mol/dm^{3}$ solution is diluted to $250 cm^{3}$ with water. What is the new concentration?
$2.495 g$ of hydrated copper(II) sulfate, $CuSO_{4} \cdot x H_{2} O$ , leaves $1.595 g$ of anhydrous solid on heating. What is $x$ ? ( $M_{r}$ : $CuSO_{4} = 159.5$ …
A reaction has a theoretical yield of $8.0 g$ and an actual yield of $6.0 g$ . What is the percentage yield?
What is the concentration in $g/dm^{3}$ of a $0.20 mol/dm^{3}$ solution of sulfuric acid, $H_{2} SO_{4}$ ? ( $A_{r}$ : H $= 1$ , S $= 32$ , O $= 16$ .)
$2.50 g$ of impure calcium carbonate is added to $50.0 cm^{3}$ of $1.00 mol/dm^{3}$ HCl (in excess). The leftover acid needs $25.0 cm^{3}$ of $0.400 mol/dm^{3}$ NaOH. Assumi…
A hydrocarbon contains $85.7%$ carbon and $14.3%$ hydrogen by mass, and its relative molecular mass is $56$ . What is its molecular formula? ( $A_{r}$ : C $= 12$ , H $= 1$ .)

Quantitative chemistry

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