workshop 2a f10 KEY

# workshop 2a f10 KEY - How many grams does one molecule of...

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Workshop 2 One mole of a monatomic atom has a mass equal to its atomic weight in grams, and it contains 6.02x10 23 atoms. One mole of a molecule has a mass equal to the sum of the atomic weights of its constituent atoms in grams, and it contains 6.02x10 23 molecules. For example, the molar mass of carbon monoxide, CO, is 28 g/mol. 1) Adapted from Exam 1, Fall 2007 a. 65.28 grams of Na 2 CO 3 is how many moles of sodium carbonate? 0.6158 moles b. How many moles of each atom are there in 33.3 moles of Fe 3 (PO 4 ) 2 ? Fe – 99.9 moles; P – 66.6 moles; O – 266 moles c. How many molecules (not moles) of dinitrogen tetroxide (N 2 O 4 ) are there in 59 g of dinitrogen tetroxide? 3.86x10 23 molecules 2) Adapted from Exam 1, Fall 2006

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Unformatted text preview: How many grams does one molecule of carbon dioxide weigh? (a carbon mono xide molecule contains one atom of carbon and one atom of oxygen what do you think carbon di oxide is?) 7.3x10-23 g is the mass of one CO 2 molecule 3) From Exam 1, Fall 2006 Given that the density of chromium is 7.19g/cm 3 , what is the approximate diameter of a chromium atom? 3 22 23 3 / 10 3 . 8 1 10 . 6 52 1 1 19 . 7 cm atoms x mole atoms x g mole cm g = By inverting you find 1.2x10-23 cm 3 /atom, the volume of one atom. Finding the diameter of the cubic volume that the atom occupies, diameter = (1.2x10-23 cm 3 ) 1/3 = 2.3x10-8 cm...
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## This note was uploaded on 02/04/2011 for the course CHEM 102 taught by Professor Peterpastos during the Fall '08 term at CUNY Hunter.

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workshop 2a f10 KEY - How many grams does one molecule of...

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