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Question
If one mole of nitrogen molecules weighs 28 g, calculate the mass of one molecule of nitrogen in grams.
Solution
Mass of one mole of nitrogen = 28g
We know that, 1 mole of nitrogen contains 6.022 × 1023 molecules.
Mass of 6.022 × 1023 nitrogen molecules = 28g
Mass of one molecule of nitrogen = 28 / 6.022 × 1023 g = 4.64 × 10-23 grams.
Hence, one molecule of nitrogen weighs 4.64 × 10-23 grams.
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