The false statement here is, 11.495 g of sodium contains 6.022 x 10^23 atoms.
a) For the first statement, the molar mass of Na is 23 g/mol
Number of moles in 22.99 g of sodium = 22.99 g/23 g/mol = 0.9996 moles
If 1 mole of Na contains 6.02 × 10^23 atoms
0.9996 moles of Na contains 0.9996 moles × 6.02 × 10^23 atoms/ 1 mole
= 6.02 × 10^23 atoms.
Since 1 mole of Be contains 6.02 × 10^23 atoms, the statement is True.
b) One mole of calcium atom is about 40 g/mol while one mole of Ne is about 20 g/mol hence one mole of calcium (Ca) weighs about as much as two moles of neon (Ne) hence the statement is true.
c) Molar mass of Na = 23 g/mol
Number of moles in 11.495 g of sodium = 11.495 g/23 g/mol = 0.4998 moles
1 mole of Na contains 6.022 x 10^23 atoms
0.4998 moles of Na contains 0.4998 moles x 6.022 x 10^23 atoms/1 mole
= 3.00 x 10^23 atoms hence the statement is false.
d) Molar mass of Al = 27 g/mol
Number of moles in 9.0 g Al = 9.0 g/27 g/mol = 0.33 moles of Al
If 1 mole of Al contains 6.022 x 10^23 atoms
0.33 moles of Al contains 0.33 moles x 6.022 x 10^23 atoms/1 mole
= 2 x 10^23 atoms.
Hence, the statement is true.
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