Question

the average atomic mass of sample of an element X is 16.2 u​

Answer 1

Answer:

Element X is oxygen

Explanation:

The atomic mass of oxygen ( o² ) is 16u & it's average atomic mass is 16.2u

Answer 2

Answer:

let the percentage of 16/8 X be A%. Then the percentage of 18/8 X be(100-8)%.

therefore, 16×A/100+8×100-A/100=16.2

=1800-2A=1620

=A=90

so, the answer is 90% 16/8X and 10% 18/8X

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