If the fluorine (F) in a quantity of this weighs 95 g

If the fluorine (F) in a quantity of this weighs 95 g

 

 

The formula for beryllium fluoride is BeF2.

If the fluorine (F) in a quantity of this weighs 95 grams,

what is the total weight of beryllium fluoride (Be, 9; F, 19)?

 

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BeF2의 몰질량 = (9) + 2(19) = 47 g/mol

 

 

 

95 g F × (47 g BeF2 / 38 g F) = 117.5 g

 

 

 

 

또는

F의 질량 백분율 = (38 g / 47 g) × 100 = 80.85%

 

95 g / (80.85/100) = 117.5 g