sample 2.76 g Ca 1.42 g F mass percent

sample 2.76 g Ca 1.42 g F mass percent

 

 

Fluorite, a mineral of calcium,

is a compound of the metal with fluorine.

Analysis shows that a 2.76 g sample of fluorite

contains 1.42 g of calcium. Calculate the

a) mass of fluorine in the sample;

b) mass fractions of calcium and fluorine in fluorite;

c) mass percents of calcium and fluorine in fluorite.

 

 

 

> Fluorite. 형석. CaF2

 

 

 

a) mass of fluorine in the sample;

2.76 – 1.42 = 1.34 g F

 

 

 

b) mass fractions of calcium and fluorine in fluorite;

> Ca: 1.42 / 2.76 = 0.51449... = 0.514

> F: 1.34 / 2.76 = 0.485507... = 0.486

 

 

 

c) mass percents of calcium and fluorine in fluorite.

> Ca: (1.42 / 2.76) × 100 = 51.4%

> F: (1.34 / 2.76) × 100 = 48.6%

 

 

 

 

[키워드] 칼슘의 광물인 형석 기준, 칼슘의 광물인 형석 사전