Answer:-
To find the number of molecules in 34.5g of CuO, follow these steps: Find the molar mass of CuO: Cu = 63.55 g/mol, O = 16 g/mol CuO molar mass = 63.55 + 16 = 79.55 g/mol Calculate moles of CuO: 34.5 g ÷ 79.55 g/mol = 0.4337 moles Find molecules using Avogadro’s number: 0.4337 × (6.022 × 10²³) = 2.61 × 10²³ molecules So, 34.5g of CuO contains approximately 2.61 × 10²³ molecules.
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