Xylene is a molecule used as a thinner for oil-based paints. SHOW WORK a. Elemen
ID: 794597 • Letter: X
Question
Xylene is a molecule used as a thinner for oil-based paints. SHOW WORK
a.Elemental analysis of a sample of xylene shows that the mass percent of carbon is 90.51% and the mass percent of hydrogen is 9.49%. What is the empirical formula of xylene?
a.The molar mass of xylene is 106.17 g/mol. What is the molecular formula of xylene?
b.Xylene burns in limited oxygen environments to produce carbon monoxide and water vapor. Write the balanced equation for this reaction.
c.If 25 g of xylene were combusted using the equation in part c, how many grams of oxygen gas would be required to react completely with xylene?
d.A vessel containing 45.8 mL of xylene (density= 0.9787 g/mL) and 31.0 g of O2 produced carbon monoxide and water. Which reactant is the limiting reagent in this reaction? How many grams of carbon monoxide are produced in the reaction?
e.If 1.40 g of CO were actually isolated from the reaction in part e, what would be the percentage yield of the reaction?
Explanation / Answer
C = 90.51 % H = 9.49 %
Dividing by molar masses.
C = 90.51 / 12 = 7.54 ; H = 9.49 / 1 = 9.49
Dividing by a common number 0.94 to convert both to the smallest whole no. ratio
C = 8 , H = 10
Empirical formula = [C8H10]
Empirical mass = 12 * 8 + 10 * 1 = 106 g
n = Molar mass / empirical mass = 1 approx
Hence Molecular formula = C8H10
2 C8H10 + 13 O2 ---------> 16 CO + 10 H20
Moles of Xylene = 25/106 = 0.23585 moles
2 moles xylene = 212 g xylene requires 13*32 g oxygen .
Hence, 25 will require 13*32*25/212 = 49 g oxygen approx.
Mass of xylene = volume * density = 0.9787*45.8 = 44.82446 g
212 g xylene requires 13*32 g oxygen = 416 g oxygen
44.82446 g will require = 416*44.82446/212 g oxygen = 87.9 g > 31 g available .
Hence, oxygen is limiting reagent.
416 g Oxygen produces 16*(12+16) g CO = 448 g CO
31 g O2 will produce = 448*31/416 = 33.38 g CO
% yield = 1.4 /33.8 * 100 = 4.2 %
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.