Chapter 3.6 and 3.7

In AS Level, we are focusing on learning concentration in molarity.

Type of Concentration

Match

Match the following

• n (mole)

• C (concentration)

• V (volume)

• m (mass)

• Mr (Molecularmass)

mol

mol/dm³

dm³

gram

gram/mol

• mol

• mol/dm³

• dm³

• gram

• gram/mol

change cm³ to dm³ (dividing the number by 1000)

Draw

Calculate the concentration, in mol dm⁻³, of Solution of sodium hydroxide, NaOH, containing 2.0 g of sodium hydroxide in 50 cm³ of solution

(Ar​ values: C = 12.0, H = 1.0, Na = 23.0, O = 16.0)

Step(moles, V unit, concentration)

Draw

Calculate the concentration, in mol dm⁻³, of solution of ethanoic acid, CH₃​CO₂​H, containing 12.0 g of ethanoic acid in 250 cm³ of solution.

(Ar​ values: C = 12.0, H = 1.0, Na = 23.0, O = 16.0)

Step(same as previous)

Draw

Calculate the number of moles of solute dissolved in 40 cm³ of aqueous nitric acid of concentration 0.2 mol dm⁻³

*concentration x volume

Draw

Calculate the number of moles of solute dissolved in 50 cm³ of calcium hydroxide solution of concentration 0.01 mol dm⁻³

*step same as previous

Open Ended

r.t.p. stands for room temperature and pressure.

All gases contain the same number of molecules.

1 mole of any gas has a volume of 24.0 dm³ at r.t.p.

the temperature is __°C and the pressure is __atm

Draw

Calculate the volume, in dm³, occupied by 26.4 g of carbon dioxide at r.t.p.

(Ar​ values: C = 12.0, O = 16.0)

Draw

A flask of volume 120 cm³ is filled with helium gas at r.t.p.

Calculate the mass of helium present in the flask. (Ar​ value: He = 4.0)

Multiple Choice

What is the volume of carbon dioxide produced when 14 g of ethene, C₂H₄​, reacts with excess oxygen? (Mr​ ethene = 28)

C₂​H₄​(g) + 3O₂​(g) → 2CO₂​(g) + 2H₂​O(l)

• 96.0 dm³

• 24.0 dm³

• 33.6 dm³

• 0.0467 dm³

Draw

50 cm³ of a gaseous hydride of phosphorus, PH_(n)​ reacts with exactly 150 cm³ of chlorine, Cl₂​, to form liquid phosphorus trichloride and 150 cm³ of hydrogen chloride gas, HCl.

a. How many moles of chlorine react with 1 mole of the gaseous hydride?

b. Deduce the formula of the phosphorus hydride.

c. Write a balanced equation for the reaction.

Home

Open in new tab

Copy link