Answer:
94.3 grams
Explanation:
MW of C2HF3O2 is 114g/mol
MW of oxygen in C2HF3O2 is 32g/mol
% composition of oxygen in C2HF3O2 = 32/114 × 100 = 28.1%
Mass of oxygen = 26.5 grams
Mass of trifluoroacetic acid = 26.5/0.281 = 94.3 grams
Answer:
94.406 grams of the trifluoroacetic acid sample.
Explanation:
Mass of oxygen in trifluoroacetic acid = 26.5 g
Moles of oxygen = [tex]\frac{26.5 g}{16 g/mol}=1.65625 mol[/tex]
1 mole of trifluoroacetic acid has 2 moles of oxygen element.
Then n moles of trifluoroacetic acid have 1.65625 mole of oxygen element.
[tex]n\times 2=1.65625 mol[/tex]
[tex]n=\frac{1.65625 mol}{2}=0.828125 mol[/tex]
Mass of 0.828125 moles of trifluoroacetic acid = m
Molar mass trifluoroacetic acid = M = 114 g/mol
[tex]m=n\times M=0.828125 mol\times 114 g/mol=94.406 g[/tex]
94.406 grams of the trifluoroacetic acid sample.
