Chemists use relative atomic masses and relative formula masses to carry out mole calculations.
The relative atomic mass of an element is the mass compared to which element?
Which is the correct relative molecular mass, Mr, for ethane C2H6? (Ar of C = 12, Ar of H = 1)
What is the percentage by mass of carbon in calcium carbonate CaCO3? (Ar of Ca = 40, Ar of C = 12, Ar of O = 16)
How many moles are present in 1 g of NaOH? (Ar of Na = 23, Ar of O = 16, Ar of H = 1)
In the following equation, what is the molar ratio between hydrochloric acid and copper(II) oxide? 2HCl + CuO → CuCl2 + H2O
1 : 2
2 : 1
1 : 1
In the reaction shown by the following equation, what mass of sulfur dioxide can be produced when 4 g of sulfur reacts with excess oxygen? (Ar of S = 32, Mr of O2 = 32, Mr of SO2 = 64). S + O2 → SO2
In an experiment, the actual yield is 8.4g but the theoretical yield is 17.0g. what is the percentage yield?