Open Question
A Freon leak in the air-conditioning system of a large building releases 12 kg of CHF2Cl per month. If the leak is allowed to continue, how many kilograms of Cl will be emitted into the atmosphere each year?
Ch.3 - Molecules, Compounds & Chemical Equations
Chapter 3, Problem 129
Estradiol is a female sexual hormone that is responsible for the maturation and maintenance of the female reproductive system. Elemental analysis of estradiol gives the following mass percent composition: C 79.37%, H 8.88%, O 11.75%. The molar mass of estradiol is 272.37 g/mol. Find the molecular formula of estradiol.
Verified step by step guidance1
<insert step 1: Assume you have 100 g of estradiol, which allows you to directly convert the mass percentages to grams: C = 79.37 g, H = 8.88 g, O = 11.75 g.>
<insert step 2: Convert the masses of each element to moles by dividing by their respective atomic masses: C (12.01 g/mol), H (1.008 g/mol), O (16.00 g/mol).>
<insert step 3: Determine the mole ratio of the elements by dividing each element's mole value by the smallest number of moles calculated in step 2.>
<insert step 4: If necessary, multiply the mole ratios by a whole number to get whole numbers for each element in the empirical formula.>
<insert step 5: Calculate the empirical formula mass and divide the molar mass of estradiol (272.37 g/mol) by the empirical formula mass to find the ratio needed to convert the empirical formula to the molecular formula.>
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Combustion analysis of a 13.42-g sample of equilin (which contains only carbon, hydrogen, and oxygen) produces 39.61 g CO2 and 9.01 g H2O. The molar mass of equilin is 268.34 g/mol. Find its molecular formula.
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Estrone, which contains only carbon, hydrogen, and oxygen, is a female sexual hormone in the urine of pregnant women. Combustion analysis of a 1.893-g sample of estrone produces 5.545 g of CO2 and 1.388 g H2O. The molar mass of estrone is 270.36 g/mol. Find its molecular formula.
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