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Question
Calculate the mass of 12.044 × 1025 molecules of oxygen (O2).
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Solution
12.044 × 1025 molecules of oxygen
Mass of 6.022 × 1023 molecules of oxygen = 32g
Mass of one molecule of oxygen = 32 / 6.022 × 1023 = 5.3 × 10−23g
Mass of 12.044 × 1025 molecules of oxygen = 5.3
10−23 × 12.044 × 1025 g = 6400g or 6.4kg
Hence, the mass of 12.044 × 1025 molecules of oxygen is 6.4kg.
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