Question

In chemical scale, the relative mass of the isotopic mixture of oxygen atoms (¹⁶O, ¹⁷O,¹⁸O) is assumed to be equal to _______.
(A) 15.002
(B) 16.00
(C) 17.00
(D) 18.00

Answer 1

Answer:

B) 16 is relative mass of isotopes of Oxygen.

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Answer 2

Dear Student,

◆ Answer - (B)

In chemical scale, the relative mass of the isotopic mixture of oxygen atoms is assumed to be equal to 16.00.

● Explanation -

• As you know, oxygen has three isotopes ¹⁶O, ¹⁷O and ¹⁸O.
• Of these, ¹⁶O is much more abundant than ¹⁷O and ¹⁸O. i.e. ¹⁶O >>> ¹⁷O and ¹⁸O.
• Therefore, atomic mass of ¹⁶O which is 16 is taken as relative mass of isotopic oxygen mixture.

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