{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Problems-Empirical formula

Problems-Empirical formula - to form water and another...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
1.Calculate the molar mass of a metal that forms an oxide having the empirical formula M 2 O 3 and contains 68.04% of the metal by mass. Identify the metal. 2) Hemoglobin is the oxygen carrying compound found in human blood. It is found to contain 0.3335% iron by mass. It is already known that one molecule of hemoglobin contains four atoms of iron. What is the molecular mass of hemoglobin? 3) For the reaction represented by the equation: CX 4 + 2 O 2 ---> CO 2 + 2 X 2 O 9.0 g of CX 4 completely reacts with 1.74 g of oxygen. What is the approximate molar mass of X? 4) A mixture of NaCl and NaBr weighing 1.234 g is heated with chlorine gas, which converts the mixture completely to NaCl. The total mass of NaCl is now 1.129 g. What are the mass percentages of NaCl and NaBr in the original sample? 5) A sample of an oxide of vanadium weighing 4.589 g was heated with hydrogen gas
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: to form water and another oxide of vanadium weighing 3.782 g. The second oxide was treated further with hydrogen until only 2.573 g of vanadium metal remained. (a) What are the simplest formulas of the two oxides? (b) What is the total mass of water formed in the successive reactions? 6) The term "alum" refers to a class of compounds of general formula MM*(SO 4 ) 2 . 12H 2 O, where M and M* are different metals. A 20.000-g sample of a certain alum is heated to drive off the water; the anhydrous residue weighs 11.123 g. Treatment of the residue with excess NaOH precipitates all the M* as M*(OH) 3 , which weighs 4.388 g. Calculate the molar mass of the alum and identity the two metals, M and M*. 7) 0.158 g of a barium halide is completely precipitated with H 2 SO 4 and 0.124 g of BaSO 4 is collected. What is the formula of the barium halide?...
View Full 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