Which of the following statements is/are INCORRECT ?
(1) The formula mass of magnesium oxide is 56.
(2) The formula mass of a compound is always a whole number.
(3) The relative molecular mass of a molecule is the relative mass of the molecule on the ^12^c = 12.00 scale.
( Relative atomic masses: O = 16.0, Mg = 24.0 )
A. (2) only B. (3) only C. (1) & (2) only D. (1) & (3) only
Which of the following ......?
2013-07-12 10:44 pm
回答 (1)
2013-07-13 2:49 am
✔ 最佳答案
The answer is : (C) (1) and (2) only(1) Incorrect
Formula mass of MgO = 24.0 + 16.0 = 40.0
(2) Incorrect
Formula mass of a compound can be calculated by summing up the relative atomicnumbers of all atoms in the molecule. Formula mass of the compound is usually NOT a whole number, because therelative atomic masses are usually NOT a whole number.
(3) Correct
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