Question

Which has more number of atoms 20 g of boron or 20 g of oxygen given mass B=11 U o 16 U?

Answer 1

Case 1 : oxygen (O)

W = 20 g

M = 16 g/mol.

Thus n = W/M

• n = 20 / 16
• n = 5/4
• n = 1.25 moles

Thus N = n × NA

• N = 1.25 × 6.022 × 10²³
• N = 7.52 × 10²³ atoms.

Case 2 : Boron (B)

W = 20 g

M = 11 g/mol.

Thus n = W/M

• n = 20/11
• n = 1.81 moles

Thus N = n × NA

• N = 1.81 × 6.022 × 10²³
• N = 10.89 × 10²³ atoms

Thus Boron has more number of atoms.

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