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Chemistry — Second Secondary

Chemistry — Second Secondary

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Chemistry — Second Secondary 2026/2027

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Quiz

Chapter 1 — Chemical Calculation — Picture questions (exam style)

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1.
A 18 g sample of CaCO₃ (Mr = 100). Which option is correct?
A 18 g sample of CaCO₃ (Mr = 100). Which option is correct?
moles = 0.18 mol, molecules = 1.08×1023
moles = 0.36 mol, molecules = 5.42×1022
moles = 18 mol, molecules = 1.08×1023
moles = 5.56 mol, molecules = 1.08×1023