Higher Chemistry - Unit 3 Part A

Hydrochloric acid reacts with magnesium according to the following equation.

Mg(s) + 2H⁺(aq) →  Mg²⁺(aq) + H₂(g)

What is the least volume of 4 mol l⁻¹ hydrochloric acid that would be required to completely react with 0·1 mol of magnesium?

• 25 ml

• 50 ml

• 100 ml

• 250 ml

• 0·10 mol of oxygen will be left unreacted.

• 0·10 mol of sodium will be left unreacted.

• 0·15 mol of oxygen will be left unreacted.

• 0·20 mol of sodium oxide will be formed

Methanol has been tested as an additive in petrol at 118 g per litre of fuel.

Calculate the volume of carbon dioxide, in litres, that would be released by combustion of 118 g of methanol.

2CH₃OH(ℓ) + 3O₂(g) → 2CO₂(g) + 4H₂O(ℓ)

(Take the molar volume of carbon dioxide to be 24 litres mol⁻¹ ).

• 88.5 L

• 177 L

• 0.41 L

• 29.5 L

The atom economy for the production of titanium in the equation shown is equal to

• 
• 
• 
• 

Which of the following gases has the same volume as 128·2 g of sulfur dioxide?

• 2 g of hydrogen

• 8 g of helium

• 32 g of oxygen

• 80.8 g of Neon

• 200 cm³

• 300 cm³

• 400 cm³

• 800 cm³

2NO(g) + O₂(g) → 2NO₂(g)

How many litres of nitrogen dioxide gas could theoretically be obtained in the reaction of 1 litre of nitrogen monoxide gas with 2 litres of oxygen gas?

(All volumes are measured under the same conditions of temperature and pressure

• 1

• 2

• 3

• 4

How many moles of oxygen atoms are in 0.25 moles of carbon dioxide?

• 0.25

• 0.5

• 1

• 2

A pupil added 0·1 mol of zinc to a solution containing 0·05 mol of silver(I) nitrate.

Zn(s) + 2AgNO₃(aq) → Zn(NO₃)₂(aq) + 2Ag(s)

Which of the following statements about the experiment is correct?

• 0·05 mol of zinc reacts.

• 0·05 mol of silver is produced

• Silver nitrate is in excess.

• All of the zinc reacts.

A mixture of potassium chloride and potassium carbonate is known to contain 0·1 mol of chloride ions and 0·1 mol of carbonate ions. How many moles of potassium ions are present?

• 0.15

• 0.20

• 0.25

• 0.30