Reference no: EM131676496

Assignment

1. Which would contain more atoms a mole of K atoms or a mole of Au atoms?

2.Cosmone is a molecule used by fragrance manufacturers to provide a rich and elegant musky essence to many perfumes. Cosmone has the molecular formula C₁₅H₂₆O.

a) calculate the molar mass of cosmone.
b) calculate the mass of 3082 moles of cosmone.
c) Calculate the number of molecules of cosmone in a sample containing 8.36 X10^-4 molcosmone.
d) Calculate the number of moles of carbon in a 8.35- mol sample of cosmone.
e) Calculate the mass of oxygen in a 4.29 g sample of cosmone.
f) Calculate the mass of a sample of cosmone that contains 6.58 x 10¹⁹
g) Calculate the mass of one molecule of cosmone,
h) Calculate the number of atoms of carbon in 8.00 g of cosmone.

3. Calculate the percent composition by mass of these compounds

A.NaBr
b.KHCO₃
C.FeCl₃
d. SiCl₄
e.Al₂(SO₄)₃
F.AgNO₃

4. Determine the empirical formula for each of the following using the given masses:
A)a compound containing 26.08 g zinc , 4.79 g carbon, and 19.14 g oxygen
b) a 150.0 g sample of a compound containing 57.66 g carbon , 7.26 g hydrogen and the remainder, chlorine
c) a 75.0 g sample of an oxide of vanadium containing 42.0g V and the remainder ,oxygen
d) a compound containing 67.35g nickel , 43.46 gg oxygen , and 23.69 g phosphorus.

5. Ethanedioic acid a compound that is present in many vegetables, has a molar mass of 90.04g/mol and a composition of 26.7%C, 2.2% H, and 71.1% O. What is the molecular formula for this substance?