Question 33 of 36intermediate🔧 ApplyNumerical3 marks

Calculate the number of atoms in each of the following (i) 52 moles of Ar (ii) 52 u of He (iii) 52 g of He

(i)
Answer

3.131×10253.131 \times 10^{25} atoms

(ii)
Answer

13 atoms

(iii)
Answer

7.828×10247.828 \times 10^{24} atoms

Explanation

To find the number of atoms, we use Avogadro's number (6.022×10236.022 \times 10^{23} atoms/mol). For moles, multiply directly by Avogadro's number. For atomic mass units (u), divide by the atomic mass of the element in u (He = 4 u). For grams, first convert to moles by dividing by the molar mass (He = 4 g/mol), then multiply by Avogadro's number.

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