Question Bank - General Science

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Which among the following is the mass of two molecules of water?

A.
5.98 À” 10-23 g
B.
36g
C.
18g
D.
36 À” 10-23 g

Solution:

Step 1: Finding Atomic Mass:The atomic mass of hydrogen = 1uThe atomic mass of oxygen = 16uMolecular mass of water (H2O) = 2 À” 1 + 1 À” 16 = 18 uHence, the Molecular mass of 2 molecules of water = 36 uStep 2: Concept of Avagadro Constant:One mole of water contains 6.023 À” 1023 water molecules.Now,Mass of water molecule for 36 u = \(\frac{36}{6.023\times 10^{23}}\) = 5.98 À” 10-23 g

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