All GCSE Chemistry, Earth Science and Radioactivity Quizzes "Doc Brown's Chemistry Clinic" EMAIL query?comment, quote Q ref [pbm-xx]) (01-06-09)

**Given the atomic masses: Cu = 64, S = 32 and O = 16; calculate the % by mass of copper in copper(II) sulphate, CuSO**[pbm-1]_{4}**Given the atomic masses: H = 1 and C = 12; calculate the % by mass of carbon in ethane, C**[pbm-2]_{2}H_{6}**Given the atomic masses: H = 1 and C = 12; calculate the % by mass of carbon in octane, C**[pbm-3]_{8}H_{18}**Given the atomic masses: H = 1, N = 14 and O = 16; calculate the % by mass of hydrogen in nitric acid, HNO**[pbm-4]_{3}**Given the atomic masses: H = 1, N = 14 and O = 16; calculate the % by mass of hydrogen in ammonium nitrate, NH**[pbm-5]_{4}NO_{3}**Given the atomic masses: H = 1, N = 14, O = 16 and S = 32; calculate the % by mass of nitrogen in ammonium sulphate, (NH**[pbm-6]_{4})_{2}SO_{4}**Given the atomic masses: H = 1, O = 16 and S = 32; calculate the % by mass of hydrogen in sulphuric acid, H**[pbm-7]_{2}SO_{4}**Given the atomic masses: O = 16, Al = 27 and S = 32; calculate the % by mass of aluminium in aluminium sulphate, Al**[pbm-8]_{2}(SO_{4})_{3}**Given the atomic masses: H = 1 and Cl = 35.5, calculate the % by mass of hydrogen in hydrogen chloride, HCl**[pbm-9]**Given the atomic masses: Na = 23 and Cl = 35.5, calculate the % by mass of sodium in sodium chloride, NaCl**[pbm-10]**Given the atomic masses: Ca = 40 and Cl = 35.5, calculate the % by mass of calcium in calcium chloride, CaCl**[pbm-11]_{2}**Given the atomic masses: H = 1, O = 16 and Mg = 24, calculate the % by mass of magnesium in magnesium hydroxide, Mg(OH)**[pbm-12]_{2}**Given the atomic masses: Al = 27 and Cl = 35.5, calculate the % by mass of aluminium in aluminium chloride, AlCl**[pbm-13]_{3}**Given the atomic masses: H = 1, O = 16 and Al = 27, calculate the % by mass of aluminium in aluminium hydroxide, Al(OH)**[pbm-14]_{3}**Given the atomic masses: H = 1, C = 12 and O = 16; calculate the % by mass of carbon in glucose, C**[pbm-15]_{6}H_{12}O_{6}**Given the atomic masses: H = 1, C = 12 and O = 16; calculate the % by mass of carbon in ethanol ('alcohol'), C**[pbm-16]_{2}H_{5}OH**Given the atomic masses: O = 16 and Fe = 56; calculate the % by mass of iron in iron(II) oxide, FeO**[pbm-17]**Given the atomic masses: O = 16 and Fe = 56; calculate the % by mass of oxygen in iron(II) oxide, FeO**[pbm-18]**Given the atomic masses: O = 16 and Fe = 56; calculate the % by mass of iron in iron(III) oxide, Fe**[pbm-19]_{2}O_{3}**Given the atomic masses: O = 16 and Fe = 56; calculate the % by mass of iron in the iron oxide, Fe**[pbm-20]_{3}O_{4}**Given the atomic masses: H = 1 and C = 12; calculate the % by mass of carbon in methane, CH**[pbm-21]_{4}**Given the atomic masses: H = 1 and C = 12; calculate the % by mass of carbon in propane, C**[pbm-22]_{3}H_{8}**Given the atomic masses: C = 12 and O = 16; calculate the % by mass of oxygen in carbon dioxide, CO**[pbm-23]_{2}**Given the atomic masses: C = 12, O = 16 and Cu = 64; calculate % by mass of copper in copper carbonate, CuCO**[pbm-24]_{3}**Given the atomic masses: C = 12, O = 16 and Ca = 40; calculate the % by mass of calcium in calcium carbonate, CaCO**[pbm-25]_{3}**Given the atomic masses: Cu = 64, S = 32 and O = 16; calculate the % by mass of oxygen in copper(II) sulphate, CuSO**[pbm-26]_{4}**Given the atomic masses: Cu = 64, S = 32 and O = 16; calculate the % by mass of sulphur in copper(II) sulphate, CuSO**[pbm-27]_{4}**Given the atomic masses: H = 1 and C = 12; calculate the % by mass of hydrogen in ethane, C**[pbm-28]_{2}H_{6}**Given the atomic masses: H = 1 and C = 12; calculate the % by mass of hydrogen in octane, C**[pbm-29]_{8}H_{18}**Given the atomic masses: H = 1, N = 14 and O = 16; calculate the % by mass of oxygen in nitric acid, HNO**[pbm-30]_{3}**Given the atomic masses: H = 1, N = 14 and O = 16; calculate the % by mass of nitrogen in nitric acid, HNO**[pbm-31]_{3}**Given the atomic masses: H = 1, N = 14 and O = 16; calculate the % by mass of nitrogen in ammonium nitrate, NH**[pbm-32]_{4}NO_{3}**Given the atomic masses: H = 1, N = 14 and O = 16; calculate the % by mass of oxygen in ammonium nitrate, NH**[pbm-33]_{4}NO_{3}**Given the atomic masses: H = 1, N = 14, O = 16 and S = 32; calculate the % by mass of hydrogen in ammonium sulphate, (NH**[pbm-34]_{4})_{2}SO_{4}**Given the atomic masses: H = 1, N = 14, O = 16 and S = 32; calculate the % by mass of sulphur in ammonium sulphate, (NH**[pbm-35]_{4})_{2}SO_{4}**Given the atomic masses: H = 1, N = 14, O = 16 and S = 32; calculate the % by mass of oxygen in ammonium sulphate, (NH**[pbm-36]_{4})_{2}SO_{4}**Given the atomic masses: H = 1, O = 16 and S = 32; calculate the % by mass of oxygen in sulphuric acid, H**[pbm-37]_{2}SO_{4}**Given the atomic masses: O = 16, Al = 27 and S = 32; calculate the % by mass of sulphur in aluminium sulphate, Al**[pbm-38]_{2}(SO_{4})_{3}**Given the atomic masses: O = 16, Al = 27 and S = 32; calculate the % by mass of oxygen in aluminium sulphate, Al**[pbm-39]_{2}(SO_{4})_{3}**Given the atomic masses: H = 1 and Cl = 35.5, calculate the % by mass of chlorine in hydrogen chloride, HCl**[pbm-40]**Given the atomic masses: Na = 23 and Cl = 35.5, calculate the % by mass of chlorine in sodium chloride, NaCl**[pbm-41]**Given the atomic masses: Ca = 40 and Cl = 35.5, calculate the % by mass of chlorine in calcium chloride, CaCl**[pbm-42]_{2}**Given the atomic masses: H = 1, O = 16 and Mg = 24, calculate the % by mass of oxygen in magnesium hydroxide, Mg(OH)**[pbm-43]_{2}**Given the atomic masses: Al = 27 and Cl = 35.5, calculate the % by mass of chlorine in aluminium chloride, AlCl**[pbm-44]_{3}**Given the atomic masses: H = 1, C = 12 and O = 16; calculate the % by mass of hydrogen in glucose, C**[pbm-45]_{6}H_{12}O_{6}**Given the atomic masses: H = 1, C = 12 and O = 16; calculate the % by mass of oxygen in glucose, C**[pbm-46]_{6}H_{12}O_{6}**Given the atomic masses: H = 1, C = 12 and O = 16; calculate the % by mass of hydrogen in ethanol ('alcohol'), C**[pbm-47]_{2}H_{5}OH**Given the atomic masses: H = 1, C = 12 and O = 16; calculate the % by mass of oxygen in ethanol ('alcohol'), C**[pbm-48]_{2}H_{5}OH**Given the atomic masses: O = 16 and Fe = 56; calculate the % by mass of oxygen in iron(III) oxide, Fe**[pbm-49]_{2}O_{3}**Given the atomic masses: H = 1 and C = 12; calculate the % by mass of hydrogen in methane, CH**[pbm-50]_{4}**Given the atomic masses: O = 16 and Fe = 56; calculate the % by mass of oxygen in the iron oxide, Fe**[pbm-51]_{3}O_{4}**Given the atomic masses: C = 12, O = 16 and Ca = 40; calculate the % by mass of carbon in calcium carbonate, CaCO**[pbm-52]_{3}**Given the atomic masses: C = 12, O = 16 and Ca = 40; calculate the % by mass of oxygen in calcium carbonate, CaCO**[pbm-53]_{3}