What is the mass of a sample of water (H₂O)containing 3.00 × 10²²H₂O molecules?

Question

Quizplus · Accepted Answer

To calculate the mass of the water sample, we need to use Avogadro's number (6.022 × 10²³ molecules per mole) and the molar mass of water (18.015 g/mol).

Number of molecules in the sample = 3.00 × 10¹² 
Number of moles = (3.00 × 10¹²) / (6.022 × 10²³) ≈ 4.98 × 10⁻¹² mol

Mass of the water sample = (4.98 × 10⁻¹² mol) × (18.015 g/mol) ≈ 9.00 × 10⁻¹¹ g ≈ 0.900 g

Therefore, the best choice is B, with a mass of 0.900 g.

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What Is the Mass of a Sample of Water (H₂O)containing