Question

2. Which has more number of
atoms, 100 grams of sodium or
100 grams of iron (given, atomic
mass of Na = 23 u. Fe = 56 u)?​

Answer 1

Explanation:

no of moles of sodium=

$\frac{100}{23} = 4.34$

4.34 moles of Na

no of moles of fe=100÷56

=1.78

no of atoms in Na= no of moles ×6.022×10²³

=4.34×6.022×10²³

=26.13548×10²³ atoms

no of atoms in fe= no of moles×6.022×10²³

=1.78×6.022×10²³

=10.71916×10²³atoms

sodium has more atoms

Answer 2

for sodium,

no. of atoms=100/23=4

for iron,

no. of atoms=100/56=1

Hence, sodium has more no. of atoms.