Problem Set 7

# Problem Set 7 - 2 CO 3 6 Calculate the requested quantity...

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Dr. Schlotter - 1 - P-Set07-F11.docx Problem Set 7 Chemistry 1130 Ch. 3 pp. 111-123 Molecular Weight, Mass, and Moles 1. What is the difference between molecular weight and formula weight? Use the following species as examples in providing an explanation. Determine the appropriate value for each. MgCl 2 P 4 O 10 2. What characteristic is shared by 52.0 g of Cr, 39.1 g of K, and 18.0 g of H 2 O? 3. Determine the mass (in grams and amu) of a molecule of CO 2 and the mass of carbon in a molecule of CO 2. 4. A sample of sodium magnesium sulfate, Na 2 Mg(SO 4 ) 2 weighs 75 grams. a) How many moles of Na 2 Mg(SO 4 ) 2 are in the sample? b) What is the weight of sodium in the sample? c) How many moles of oxygen atoms are in the sample? d) How many magnesium atoms are in the sample? 5. Which contains more atoms of Na, 15.4 g of NaBr or 55.8 g of Na
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Unformatted text preview: 2 CO 3 ? 6. Calculate the requested quantity in each case. a) The number of atoms of Na in a 2.43 g sample of NaCl b) The number of moles of C 6 H 12 O 6 in a 21.4 g sample. c) The mass in grams of KMnO 4 required to provide 3.0 moles of Mn. 7. Calculate the probability of finding each possible combination of heads and tails for two pennies where the order of getting a head or tail is unimportant. If you replace the pennies with Cl atoms on a CH 2 Cl 2 molecule and it is given that the natural abundance of the two chlorine isotopes, 35 Cl and 37 Cl, is 75% and 25% (assume only 12 C and 1 H are present) what are the probabilities and masses of the CH 2 Cl 2 molecule that you would see in a mass spectrometer? Ch. 3 Book problems: 3.26, 3.30, 3.56, 3.40, 3.60, 3.86, 3.90, 3.112...
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