A mixture contained no fluorine compound except methyl fluoroacetate, FCH₂COOCH₃ (molar mass = 92.1 g/mol. When chemically treated, all the fluorine was converted to CaF₂ (molar mass = 78.1 g/mol). The mass of CaF₂ obtained was 12.1 g. Find the mass of methyl fluoroacetate in the original mixture.

Question

Quizplus · Accepted Answer

The molar mass of CaF2 is 78.1 g/mol, and it contains 2 moles of F. The mass of CaF2 obtained is 12.1 g, which corresponds to 12.1 g / 78.1 g/mol = 0.155 moles of CaF2. This means there were 0.155 moles of F in the original mixture. Methyl fluoroacetate has 1 mole of F per mole, so there were 0.155 moles of methyl fluoroacetate. The mass of methyl fluoroacetate is 0.155 moles * 92.1 g/mol = 14.3 g.

A Mixture Contained No Fluorine Compound Except Methyl Fluoroacetate, FCH2COOCH3

A Mixture Contained No Fluorine Compound Except Methyl Fluoroacetate, FCH₂COOCH₃