grams of eth 2. A student deermined that ethanol contains only C, H and O. ie fo
ID: 1038938 • Letter: G
Question
grams of eth 2. A student deermined that ethanol contains only C, H and O. ie found mprical formula of contains 6.00 grams of carbon and 1.51 grams of hydrogen. ethanol? What is the A compound was analyzed and has been found to have the following composition: copper 66.75%, phosphorus 10.84%, and oxygen 22.41%. Determine the empirical formula of the 3. A compound having an approximate molar mass of 165 to 170 g has the following percentage composition by mass: carbon, 42.87%, hydrogen 3.598%, oxygen 28.55% and nitrogen 25.00%. Determine the empirical formula and the molecular formula of the compound 4.Explanation / Answer
2.
Mass of ethanol = 11.5 g.
Mass of C = 6.00 g.
Mass of H = 1.51 g.
Mass of O = 11.5 - 6.00 - 1.51 = 3.99 g.
% by mass of C = 6.00 * 100 / 11.5 = 52.2 %
% by mass of H = 1.51 * 100 / 11.5 = 13.1 %
% by mass of O = 3.99 * 100 / 11.5 = 34.7 g.
NOW,
element Mass Number of moles division by small number nearest whole number
C 52.2 52.2 / 12 = 4.35 4.35 / 2.17 = 2.00 2
H 13.1 13.1 / 1 = 13.1 13.1 / 2.17 = 6.04 6
O 34.7 34.7 / 16 = 2.17 2.17 / 2.17 = 1.00 1
Emperical formula of ethanol = C2H6O
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.