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An Avogadro number of atoms of Boron make up 1 mole of Boron atom.

6.02 10²³ atoms make up 1 mole of Boron atom.

1.20 10²⁴ atoms will:                  (1.20 10²⁴ 1 ) / (6.02 * 10²³)

                                                     ≈1.993 Mole of Boron atom.

Answer: 2 moles

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number \(6.023\times 10^{23}\) of particles.

Standard condition of temperature (STP)  is 273 K and atmospheric pressure is 1 atm respectively.

To calculate the moles, we use the equation:

\(\text{Number of moles}=\frac{\text{Given atoms}}{\text {Avogadro's number}}=\frac{1.20\times 10^{24}}{6.023\times 10^{23}}=2moles\)

Thus 2 moles of boron make up \(1.20\times 10^{24}\) atoms of boron.

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