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What is the mass of water which contains 50% heavy water (D2O)?

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What is the mass of water which contains 50% heavy water (D2O)?

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Water containing half H2O and half D2O will have mass = average of masses of,H2O (18) and D2O (20)
Mass of water = \(\frac{(18 + 20)}{ 2}\) = \(\frac{38}{2}\) = 19

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