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Determine the empirical formulas for compounds with the following percent compositions: (a) 15.8% carbon and 84.2% sulfur. (b) 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen. Answer a. Answer b. Click here to see a video of the solution.
A 10.00 g sample of vitamin C was analyzed and found to contain 4.092 g of C, 0.458 g of H, and 5.450 g of O. Given that the molar mass of the compound is 176g, determine the molecular formula of vitamin C. (answer: C
Empirical/Molecular Formula Practice Worksheet. Directions: Find the empirical AND molecular formulas given the percent compositions or masses. SHOW YOUR WORK to receive full credit. 1) 26.4 % Carbon. 3.3 % Hydrogen. 70.3 % Oxygen. Empirical Formula:_________________. 2) 81.8 grams Carbon.
Empirical and Molecular Formula Worksheet ANSWER KEY. Write the empirical formula for the following compounds. A compound with an empirical formula of C2OH4 and a molar mass of 88 grams per mole. What is the molecular formula of this compound? A compound with an empirical formula of C4H4O and a molar mass of 136 grams per mole.
Example 1: A compound is found to be 53% Al and 47% O. Find its empirical formula. Solution: Convert the quantities to grams rather than percentages. Assuming a sample weight of 100 g, there would be 53 g of Al and 47 g of O. Convert these quantities to moles: 1mol Al.
Empirical and molecular formula calculations. Let the unknown metal be X. As it is in group 1 the empirical formula must be XCl. There is 47.6% Cl, so the percentage composition of X must be 52.4%. X = 39.02 and the formula is KCl. Pearson Education Australia (a division of Pearson Australia Group Pty Ltd) 2008.
Worksheet. 1) What is the empirical formula for C8H18? 2) What is the empirical formula for H2O? 3) What is the empirical formula for C4H10? 4) What is the empirical formula for C2H4O2? 5) Is CO2 an empirical formula, a molecular formula, or both? Explain.
