A compound with the formula xf2 has a relative formula mass of 78. What is element x?
Answers
Answered by
15
The atomic mass of fluorine atom is 19
F2 = 38
Atomic mass of element X
= 78-38=40
X is calcium
Answered by
5
Answer: Argon (Ar)
Explanation:
Argon has a mass of 40.
Fluoride has a mass of 19×2=38
Therefore, 40+38= 78.
The answer is also Calcium because Ca has a mass of 40 as well.
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