Answer:
C2H6O
Explanation:
<u>First, find the masses of C, H, and O. I used ratios.</u>
3.117g CO2 x 1 mol CO2/44.01g CO2 x 1 mol C/1 mol CO2 x 12.01g C/1 mol C = 0.850606 g C
1.911g H2O x 1 mol H2O/18.016g H2O x 2 mol H2O/1 mol H2O x 1.008g H/1 mol H = 0.213842 g H
To find the mass of oxygen, just add the masses of C and H together and subtract that from the total mass of the sample.
1.638 - (0.850606 + 0.213842) = 0.57355 g O
<u>Second, find the moles of C, H, and O.</u>
0.850606g C x 1 mol C/12.01g C = 0.070825 mol C
0.213842g H x 1 mol H/1.008g H = 0.212145 mol H
0.57355 g O x 1 mol O/16g O = 0.035847 mol O
<u>Finally, divide the number of moles of each element by the smallest value of moles calculated. In this case, the smallest value is 0.035847.</u>
0.070825/0.035847 = 2
0.212145/0.035847 = 6
0.035847/0.035847 = 1
