CHEM 1040 Lecture Notes - Lecture 6: Combustion Analysis, Chemical Formula, Bayerischer Rundfunk
Ch. 3 Study Questions
• Calculate the molar mass of Ca(BO2)2 x 6H20
o 273.87 g/mol
o 233.79 g/mol
o 183.79 g/mol
o 174.89 g/mol
o 143.71 g/mol
• Calculate the number of O atoms in 29.34 g of sodium sulfate Na2SO4
o 1.224 x 10^23 O atoms
o 2.915 x 10^24 O atoms
o 1.166 x 10^25 O atoms
o 4.976 x 10^23 O atoms
o 2.409 x 10^23 O atoms
• A normal breath is about 1.0 L of air. If air has an average molar mass of 28.8 g/mole,
and a density of 0.97 g/L, how many molecules of air do you take in with each breath?
o 2.0 x 10^22
o 2.2 x 10^22
o 5.8 x 10^23
o 1.7 x 10^25
o 1.8 x 10^25
• What % of the atoms in sucrose, C12 H22 O11 are C toms?
o 42.1 %
o 26.7 %
o 33.3 %
o 41.4 %
o 52.8 %
• What is the % of carbon in sucrose C12 H22 O11 by mass?
o 42.1 %
o 26.7 %
o 33.3 %
o 41.4 %
o 52.8%
• Sample was found to contain 2.05 mol of Cr and 1.37 mol of Si. What is the empirical
formula of the compound?
o CrSi3
find more resources at oneclass.com
find more resources at oneclass.com
