
On-line chemical calculations Quiz for Higher GCSE (includes moles!)
Given the atomic masses: Cu = 64, S = 32 and O = 16; calculate the % by mass of copper in copper(II) sulphate, CuSO4 [pbm-1]
Given the atomic masses: H = 1 and C = 12; calculate the % by mass of carbon in ethane, C2H6 [pbm-2]
Given the atomic masses: H = 1 and C = 12; calculate the % by mass of carbon in octane, C8H18 [pbm-3]
Given the atomic masses: H = 1, N = 14 and O = 16; calculate the % by mass of hydrogen in nitric acid, HNO3 [pbm-4]
Given the atomic masses: H = 1, N = 14 and O = 16; calculate the % by mass of hydrogen in ammonium nitrate, NH4NO3 [pbm-5]
Given the atomic masses: H = 1, N = 14, O = 16 and S = 32; calculate the % by mass of nitrogen in ammonium sulphate, (NH4)2SO4 [pbm-6]
Given the atomic masses: H = 1, O = 16 and S = 32; calculate the % by mass of hydrogen in sulphuric acid, H2SO4 [pbm-7]
Given the atomic masses: O = 16, Al = 27 and S = 32; calculate the % by mass of aluminium in aluminium sulphate, Al2(SO4)3 [pbm-8]
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, CaCl2 [pbm-11]
Given the atomic masses: H = 1, O = 16 and Mg = 24, calculate the % by mass of magnesium in magnesium hydroxide, Mg(OH)2 [pbm-12]
Given the atomic masses: Al = 27 and Cl = 35.5, calculate the % by mass of aluminium in aluminium chloride, AlCl3 [pbm-13]
Given the atomic masses: H = 1, O = 16 and Al = 27, calculate the % by mass of aluminium in aluminium hydroxide, Al(OH)3 [pbm-14]
Given the atomic masses: H = 1, C = 12 and O = 16; calculate the % by mass of carbon in glucose, C6H12O6 [pbm-15]
Given the atomic masses: H = 1, C = 12 and O = 16; calculate the % by mass of carbon in ethanol ('alcohol'), C2H5OH [pbm-16]
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, Fe2O3 [pbm-19]
Given the atomic masses: O = 16 and Fe = 56; calculate the % by mass of iron in the iron oxide, Fe3O4 [pbm-20]
Given the atomic masses: H = 1 and C = 12; calculate the % by mass of carbon in methane, CH4 [pbm-21]
Given the atomic masses: H = 1 and C = 12; calculate the % by mass of carbon in propane, C3H8 [pbm-22]
Given the atomic masses: C = 12 and O = 16; calculate the % by mass of oxygen in carbon dioxide, CO2 [pbm-23]
Given the atomic masses: C = 12, O = 16 and Cu = 64; calculate % by mass of copper in copper carbonate, CuCO3 [pbm-24]
Given the atomic masses: C = 12, O = 16 and Ca = 40; calculate the % by mass of calcium in calcium carbonate, CaCO3 [pbm-25]
Given the atomic masses: Cu = 64, S = 32 and O = 16; calculate the % by mass of oxygen in copper(II) sulphate, CuSO4 [pbm-26]
Given the atomic masses: Cu = 64, S = 32 and O = 16; calculate the % by mass of sulphur in copper(II) sulphate, CuSO4 [pbm-27]
Given the atomic masses: H = 1 and C = 12; calculate the % by mass of hydrogen in ethane, C2H6 [pbm-28]
Given the atomic masses: H = 1 and C = 12; calculate the % by mass of hydrogen in octane, C8H18 [pbm-29]
Given the atomic masses: H = 1, N = 14 and O = 16; calculate the % by mass of oxygen in nitric acid, HNO3 [pbm-30]
Given the atomic masses: H = 1, N = 14 and O = 16; calculate the % by mass of nitrogen in nitric acid, HNO3 [pbm-31]
Given the atomic masses: H = 1, N = 14 and O = 16; calculate the % by mass of nitrogen in ammonium nitrate, NH4NO3 [pbm-32]
Given the atomic masses: H = 1, N = 14 and O = 16; calculate the % by mass of oxygen in ammonium nitrate, NH4NO3 [pbm-33]
Given the atomic masses: H = 1, N = 14, O = 16 and S = 32; calculate the % by mass of hydrogen in ammonium sulphate, (NH4)2SO4 [pbm-34]
Given the atomic masses: H = 1, N = 14, O = 16 and S = 32; calculate the % by mass of sulphur in ammonium sulphate, (NH4)2SO4 [pbm-35]
Given the atomic masses: H = 1, N = 14, O = 16 and S = 32; calculate the % by mass of oxygen in ammonium sulphate, (NH4)2SO4 [pbm-36]
Given the atomic masses: H = 1, O = 16 and S = 32; calculate the % by mass of oxygen in sulphuric acid, H2SO4 [pbm-37]
Given the atomic masses: O = 16, Al = 27 and S = 32; calculate the % by mass of sulphur in aluminium sulphate, Al2(SO4)3 [pbm-38]
Given the atomic masses: O = 16, Al = 27 and S = 32; calculate the % by mass of oxygen in aluminium sulphate, Al2(SO4)3 [pbm-39]
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, CaCl2 [pbm-42]
Given the atomic masses: H = 1, O = 16 and Mg = 24, calculate the % by mass of oxygen in magnesium hydroxide, Mg(OH)2 [pbm-43]
Given the atomic masses: Al = 27 and Cl = 35.5, calculate the % by mass of chlorine in aluminium chloride, AlCl3 [pbm-44]
Given the atomic masses: H = 1, C = 12 and O = 16; calculate the % by mass of hydrogen in glucose, C6H12O6 [pbm-45]
Given the atomic masses: H = 1, C = 12 and O = 16; calculate the % by mass of oxygen in glucose, C6H12O6 [pbm-46]
Given the atomic masses: H = 1, C = 12 and O = 16; calculate the % by mass of hydrogen in ethanol ('alcohol'), C2H5OH [pbm-47]
Given the atomic masses: H = 1, C = 12 and O = 16; calculate the % by mass of oxygen in ethanol ('alcohol'), C2H5OH [pbm-48]
Given the atomic masses: O = 16 and Fe = 56; calculate the % by mass of oxygen in iron(III) oxide, Fe2O3 [pbm-49]
Given the atomic masses: H = 1 and C = 12; calculate the % by mass of hydrogen in methane, CH4 [pbm-50]
Given the atomic masses: O = 16 and Fe = 56; calculate the % by mass of oxygen in the iron oxide, Fe3O4 [pbm-51]
Given the atomic masses: C = 12, O = 16 and Ca = 40; calculate the % by mass of carbon in calcium carbonate, CaCO3 [pbm-52]
Given the atomic masses: C = 12, O = 16 and Ca = 40; calculate the % by mass of oxygen in calcium carbonate, CaCO3 [pbm-53]




















A cracking reaction to break down a large hydrocarbon molecule into, in order, hexane, propene and ethene, is shown below.
A cracking reaction to break down a large hydrocarbon molecule into, in order, hexane, propene and ethene, is shown below.
A cracking reaction to break down a large hydrocarbon molecule into, in order, hexane, propene and ethene, is shown below.
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the Ar's: H=1 and Cl=35.5:
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the Ar's: H=1 and Cl=35.5:
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the Ar's: H=1 and Cl=35.5:
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the Ar's: H=1 and Cl=35.5:
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the Ar's: H=1 and Cl=35.5:
Given below are the electrode equations for the electrolysis of aqueous sodium chloride (brine) and the Ar's: H=1 and Cl=35.5:
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al3O3) and the Ar's: Al=27 and O=16:
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al3O3) and the Ar's: Al=27 and O=16:
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al3O3) and the Ar's: Al=27 and O=16:
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al3O3) and the Ar's: Al=27 and O=16:
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al3O3) and the Ar's: Al=27 and O=16:
Given below are the electrode equations for the electrolysis of molten aluminium oxide ore (Al3O3) and the Ar's: Al=27 and O=16:
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