Q.

The molecular mass of water (H2O) is 18 u . The atomic mass of hydrogen is 1u. Find the atomic mass of oxygen.

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a

8

b

10

c

16

d

20

answer is C.

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Detailed Solution

Molecular mass of water =  2X atomic mass of hydrogen + 1 X atomic mass of oxygen

  18 =  2X 1 + atomic mass of oxygen

  18 = 2 + atomic mass of oxygen

Atomic mass of oxygen = 18-2  = 16u

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