Mole Calculations
29 past-paper questions on Mole Calculations · examined 2020–2025.
20254 questions
Calculate the mass of a sample of chlorine gas containing 1.204 × 10^20 molecules.
Calculate the number of molecules of hydrogen peroxide in a sample with a mass of 0.170 g.
Calculate the total number of atoms in this sample of hydrogen peroxide.
Calculate the number of moles of hydroxide ions, OH–, in 25.0 cm3 of X.
20243 questions
Calculate the number of moles of NaOH in 25.0 cm3 of 0.800 mol / dm3 NaOH(aq).
100 cm3 of the aqueous ethanedioic acid contains 6.3 g of C2H2O4•nH2O. Use your answer from (e) to calculate the relative formula mass, Mr, of C2H2O4•nH2O.
Use your answer from (f)(i) to deduce the value of n in C2H2O4•nH2O. Give your answer to the nearest whole number.
20231 question
How many sodium ions are there in 30 g of sodium sulfate?
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