Stoichiometry
43 past-paper questions on Stoichiometry · examined 2023–2025.
20258 questions
What is the relative formula mass, Mr, of calcium hydroxide, Ca(OH)2?
A sample of element Q has two isotopes. Their relative masses and abundances are shown. What is the relative atomic mass of this sample of Q to three significant figures?
When 65 g of zinc reacts with 32 g of sulfur, 97 g of zinc sulfide is produced. When 65 g of zinc reacts with 40 g of sulfur, the mass of zinc sulfide produced is still 97 g. Which statement explains this observation?
The concentration of a solution of aqueous sodium hydroxide is 0.50 mol / dm3. Which mass of sodium hydroxide is used to make 500 cm3 of this solution?
Name the positive ion that has the highest concentration.
State the formula of the sulfate ion.
Calculate the mass of nitrate ions, NO3– , in 200 cm3 of river water.
Complete Table 4.1 to calculate the relative molecular mass of C11H14O3.
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