Quantitative Chemistry: The Mole
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What is Avogadro’s constant?
The number of atoms, molecules or ions in 1 mole of a given substance
What is the value of Avogadro’s constant?
6.02 x 1023
What is the formula linking mass, relative formula mass (Mr) and moles together?
mass = Mr x moles
What is the mass of 20 moles of calcium carbonate, CaCO3?
mass = Mr x moles Mr = 100 100 x 20 =2,000g
Calculate the amount of carbon dioxide in moles in 0.32g of carbon dioxide.
moles = mass/Mr 0.32/44 =0.00727
Nitrogen and hydrogen form ammonia shown by the following equation: N2 + 3H2 ⇄ 2NH3. Calculate the mass of nitrogen needed to form 6.8 tonnes of ammonia.
5.6 tonnes
Hydrogen peroxide (H2O2) decomposes in water to form water and oxygen. How many grams of oxygen gas will be given off from 40.8g of hydrogen peroxide?
19.2g
What’s are the two formulae linking concentration, mass and volume together?
Concentration (g per dm3) = mass (g)/volume(dm3) Concentration (mol per dm3) = no. of moles /volume(dm3)
31cm3 of potassium hydroxide solution neutralised 25cm3 of 2moldm-3 nitric acid. HNO3 + KOH → KNO3 + H2O. Calculate the concentration of the potassium hydroxide solution in moldm-3.
1.61moldm-3
What is the molar volume of a gas at room temperature and pressure?
1 mole of a gas at room temperature and pressure occupies 24dm3