urea preparation, Chemistry

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how to prepare 100ml of 40% urea solution

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Mole fraction, The mole fraction of solute and solvent is equal to

The mole fraction of solute and solvent is equal to

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Uncertainty in position of a 0.25 g particle is 10 -5   . Uncertainty of velocity  ( h = 6.6 x 10 -34 Js) is: (1)  1.2 x 10 34       (2)  2.1 x 10 -29   (3)  1.6 x 1

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When the value of azimuthal quantum number is 3, magnetic quantum number can have values: (1) + 1, 0, - 1           (2) + 2, + 1, 0, - 1, - 2  (3) - 3, - 2, - 1, - 0, + 1

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