The number of atoms in 0.0340g of Zinc (Zn) is 3.148 × 10²⁰ atoms.
HOW TO CALCULATE NUMBER OF ATOMS:
- The number of atoms contained in a substance can be calculated by multiplying the number of moles of that substance by Avogadro's number (6.02 × 10²³). That is;
no. of atoms = no. of moles × 6.02 × 10²³
- In this question, we must first convert 0.0340g of Zinc to moles by using the following formula:
no. of moles = mass ÷ molar mass
no of moles = 0.0340g ÷ 65g/mol
no of moles = 5.23 × 10-⁴mol
- Hence, the number of atoms in Zinc is as follows:
no of atoms = 5.23 × 10-⁴ × 6.02 × 10²³
no. of atoms = 5.23 × 6.02 × 10²³-⁴
no of atoms = 31.48 × 10¹⁹
no of atoms = 3.148 × 10²⁰ atoms.
- Therefore, the number of atoms in 0.0340g of Zinc (Zn) is 3.148 × 10²⁰ atoms.
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