A compound contains 400 c 671 h and 5329 o by mass

Info icon This preview shows pages 6–9. Sign up to view the full content.

View Full Document Right Arrow Icon
34. A compound contains 40.0% C, 6.71% H, and 53.29% O by mass. The molecular mass of the compound is 60.05 amu. The molecular formula of this compound is __________. a. C 2 H 4 O 2 b. CH 2 O c. C 2 H 3 O 4 d. C 2 H 2 O 4 e. CHO 2 35. The empirical formula of a compound is NO 2 and the formula weight is (89 ñ 6) amu. The molecular formula is ____________. 36. The empirical formula of a compound whose molecular formula is C 6 H 12 and whose molecular weight 84.16 amu is __________. 37. A compound with a molecular weight of 110.1 amu that contained only C, H, and O was analyzed by combustion. The combustion of a 5.19 g sample of the compound resulted in the formation of 12.4 g of carbon dioxide and 2.55 g of water. What is the molecular formula of this compound?
Image of page 6

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
38. A 1.29 g sample of a compound composed of C, H, and O was burned in oxygen. If 1.26 g of CO 2 and 0.258 g of water were produced, the composition (by mass %) of the compound was _____% C, _____% H, and _____ O. a. 34.4, 2.90, 92.0 b. 12.6, 25.8, 61.6 c. 26.7, 2.24, 71.3 d. 12.0, 72.0, 16.0 e. 41.4, 3.44, 55.2 39. What is the molecular formula of a compound that is 37.9% carbon, 11.6% hydrogen, and 50.5% oxygen by mass, and that has a formula weight of 190.24 amu? 40. Combustion analysis of 1.031 g of a compound with a formula weight of 180.27 amu and containing only carbon, hydrogen, and oxygen yielded 2.265 g CO 2 and 1.236 g H 2 O. What is the molecular formula of the compound? 41. What mass (g) of magnesium nitride (Mg 3 N 2 ) can be made from the reaction of 1.22 g of magnesium with excess nitrogen? 42. A sample of nitrogen (9.27 g) reacts completely with magnesium, according to the equation: 3 Mg + N 2 ----> Mg 3 N 2 The mass of Mg consumed is _____ g. a. 8.04 b. 24.1 c. 16.1 d. 0.92 e. 13.9 43. What mass (g) of oxygen is required to burn 28.8 g of ammonia? Be sure to balance the reaction. NH 3 + O 2 -----> NO 2 + H 2 O
Image of page 7
Image of page 8

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern