Tuition Singapore A Level Chemistry Tuition – Atoms, Molecules and Stoichiometry

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Tuition Singapore A Level Chemistry Tuition – Atoms, Molecules and Stoichiometry

Question

Which one of the following statements about 20.3 g of Co2(SO4)3 is incorrect? [Molar mass = 406 g mol-1, Avogadro’s constant = 6.0 x 1023 mol-1]

A       It contains 0.10 mol of Co3+ ions.

B      It contains 0.15 mol of SO42- ions.

C      It contains 47.3% of oxygen by mass.

D      It contains 1.5 x 1023 atoms.

Solution

Tuition Singapore A Level Chemistry Tuition – Atoms, Molecules and Stoichiometry

Please contact Angie @ 96790479 or Mr Ong @ 98639633 if you need tuition in A Level/JC H2/H1 Chemistry