Answered

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Which of the following BEST represents 3.0 moles of an element?

Select one answer
А
2.02 grams of H
B
14 grams of N
C
4 grams of He
D
27 grams of Be

Sagot :

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Answer: D: Berylium, Be

Explanation:

The atomic mass of Be is 9.0. This is also it's molar mass (9 grams/mole). 3 moles of Be would therefore be (3 moles)*(9 grams/mole) = 27 grams.

That's what D (27 g of Be) offers as an answer.

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