1.

Oxygen contains 90% of O^(16) and 10 % " of " O^(18). Its atomic mass is

Answer»

`17.4`
`16.2`
`16.5`
17

Solution :OXYGEN has 90% `O^(16) and 10 % O^(18)`
Atomic mass = `[(90)/(100) xx 16 + (10)/(100) xx 18]`
`= (1440 + 180)/(100) = (1620)/(100) = 16.2`


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