A compound contains only calcium and fluorine. A sample of the compound is determined to contain 2.00 g of calcium and 1.90 g of fluorine. According to the Law of Definite Proportions, how much calcium should another sample of this compound contain if it contains 2.85 g of fluorine?
a. 2.71 g
b. 4.00 g
c. 3.00 g
d. 4.50 g
e. 6.00 g
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