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?

4·6 g of sodium is added to 4·8 litres of oxygen to form sodium oxide. When the reaction is complete, which of the following statements will be true? (Take the volume of 1 mole of oxygen to be 24 litres.)

4Na + O₂ $$\rightarrow$$ 2Na₂O

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 ).

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?

2C₂H₂(g) + 5O₂(g) $$\rightarrow$$ 4CO₂(g) + 2H₂O(l)

What volume of gas would be produced by the complete combustion of 100 cm³ of ethyne gas?

All volumes were measured at atmospheric pressure and room temperature.

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

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

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?

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?