Mole Concept

Mole Concept Content Formula List for Mole Concept Name Formula Number of moles 𝑀𝑎𝑠𝑠 𝑜𝑓 𝑠𝑢𝑏𝑠𝑡𝑎𝑛𝑐𝑒 (𝑔) 𝑀𝑜𝑙𝑎𝑟 𝑀𝑎𝑠𝑠 𝑜𝑓 𝑠𝑢𝑏𝑡𝑎𝑛𝑐𝑒 Percentage Composition 𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑎𝑡𝑜𝑚𝑠 ×𝐴𝑡𝑜𝑚𝑖𝑐 𝑀𝑎𝑠𝑠 𝑜𝑓 𝑒𝑙𝑒𝑚𝑒𝑛𝑡 𝑀𝑜𝑙𝑎𝑟 𝑚𝑎𝑠𝑠 𝑜𝑓 𝑐𝑜𝑚𝑝𝑜𝑢𝑛𝑑 x 100% Number of moles (gases at r.t.p) 𝑉𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑔𝑎𝑠 24𝑑𝑚3 Concentration (𝑔/𝑑𝑚3) 𝑀𝑎𝑠𝑠 𝑜𝑓 𝑠𝑢𝑏𝑠𝑡𝑎𝑛𝑐𝑒 𝑉𝑜𝑙𝑢𝑚𝑒 Concentration (𝑚𝑜𝑙/ 𝑑𝑚3) 𝑀𝑎𝑠𝑠 𝑜𝑓 𝑠𝑢𝑏𝑠𝑡𝑎𝑛𝑐𝑒 𝑉𝑜𝑙𝑢𝑚𝑒 ÷ Molar Mass of solute OR 𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑚𝑜𝑙𝑒𝑠 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑒 𝑉𝑜𝑙𝑢𝑚𝑒 Percentage Purity 𝐶𝑎𝑙𝑐𝑢𝑙𝑎𝑡𝑒𝑑 𝑚𝑎𝑠𝑠 𝑜𝑓 𝑠𝑢𝑏𝑠𝑡𝑎𝑛𝑐𝑒 𝑖𝑛 𝑠𝑎𝑚𝑝𝑙𝑒 𝑀𝑎𝑠𝑠 𝑜𝑓 𝑠𝑎𝑚𝑝𝑙𝑒 x 100% Percentage Yield 𝑚𝑎𝑠𝑠 𝑜𝑓 𝑠𝑢𝑏𝑠𝑡𝑎𝑛𝑐𝑒 𝑜𝑏𝑡𝑎𝑖𝑛𝑒𝑑 𝑇ℎ𝑒𝑜𝑟𝑒𝑡𝑖𝑐𝑎𝑙 𝑚𝑎𝑠𝑠 𝑦𝑖𝑒𝑙𝑑 x 100% 1 mol of substance 6 x 1023 particles Test yourself 1. Define Relative Atomic Mass 2. Define Relative Molecular/Formula Mass 3. State the formula to find i. Number of moles ii. Percentage Composition iii. Number of moles (gases at r.t.p) iv. Concentration 𝑔/𝑑𝑚3 v. Concentration 𝑚𝑜𝑙/𝑑𝑚3 vi. Percentage Purity vii. Percentage Yield viii. 1 mol of substance 4. At r.t.p, Mole ratio = _________? Glossary of Terms Relative Atomic Mass The average mass of one atom of an element as compared to 1/12 of the mass of one Carbon-12 atom Relative Molecular Mass The average mass of one molecule of an element or compound as compared to 1/12 of the mass of one Carbon-12 atom