04 AtomsIsotopesIons

# 04 AtomsIsotopesIons - A Problem from Last time You...

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1 1 A Problem from Last time You purchased an antique coin and want to identify its composition from its density. You weighed the coin and found its mass to be 81.2117 g. When you placed the coin in a graduated cylinder containing 105.53 mL of water, the water level rose to 114.64 mL. Calculate the density of the coin from these measurements, and determine how many significant figures should be in the result. A) 8.914566 g/mL B) 8.9146 g/mL C) 8.91 g/mL D) 8.9 g/mL 2 Mass = 81.2117 g 6 sig figs Volume 114.64 mL 105.53 mL 9.11 mL Density = 81.2117 g / 9.11 mL = 8.91456641 g/mL The divisor only has 3 sig figs so the quotient only is known to 3 sig figs. Your measured density is 8.91 g/mL The density of gold is 19.3 g/mL. The density of nickel is 8.91 g/mL. The density of copper is 8.96 g/mL 5 sig figs 3 sig figs

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2 3 Course Schedule posted on Bb in Assignments section! More SmartWork quizzes have been posted on SmartWork . Check after every class meeting.
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## This note was uploaded on 06/04/2011 for the course CHE 129 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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04 AtomsIsotopesIons - A Problem from Last time You...

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