4-2 Define mole and Avogadro number

4-2-1. Which of these is false?
A. A mole of atoms contains exactly 6.02x10²³ atoms.
B. The exact number of molecules in one mole of molecules is equal to Avogadro's number.
C. The exact number of ions in one mole of ions is equal to Avogadro's number.
D. None of the above.

4-2-2. Which has more atoms?
A. 1 mole of Mg-24
B. 1 mole of Mg-26
C. neither




4-2-3. Which has more molecules?
A. 1 mole of SO₂
B. 1 mole of SO₃
C. neither