Solution (1)
no. of atoms = n × N
no. of atoms = 18 mol × 6.02 × 10²³ atoms/mol
[tex]\boxed{\text{no. of atoms = 1.08 × 10²⁵ atoms}}[/tex]
Solution (2)
Step 1: Calculate the number of moles of Fe.
[tex]n = \frac{m}{MM}[/tex]
[tex]n = \frac{\text{560 g}}{\text{56 g/mol}}[/tex]
[tex]n = \text{10 mol}[/tex]
Step 2: Calculate the number of atoms of Fe.
no. of atoms = n × N
no. of atoms = 10 mol × 6.02 × 10²³ atoms/mol
[tex]\boxed{\text{no. of atoms = 6.02 × 10²⁴ atoms}}[/tex]
Solution (3)
no. of ions = n × N
no. of ions = 8 mol × 6.02 × 10²³ ions/mol
[tex]\boxed{\text{no. of ions = 4.82 × 10²⁴ ions}}[/tex]
Solution (4)
Step 1: Calculate the molar mass of NaOH.
MM = (23 g/mol × 1) + (16 g/mol × 1) + (1 g/mol × 1)
MM = 40 g/mol
Step 2: Calculate the number of moles of NaOH.
[tex]n = \frac{m}{MM}[/tex]
[tex]n = \frac{\text{35 g}}{\text{40 g/mol}}[/tex]
[tex]n = \text{0.875 mol}[/tex]
Step 3: Calculate the number of molecules of NaOH.
no. of molecules = n × N
no. of molecules = 0.875 mol × 6.02 × 10²³ molecules/mol
[tex]\boxed{\text{no. of molecules = 5.27 × 10²³ molecules}}[/tex]
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