Question

Density A piece of volcanic rock washed up on the 79th Street Beach. The rock has a volume of 863 ml and a mass of 729 grams. (a) What is the rock's density? D = ? (b) If the nearest volcano is in Martinique, how did the rock probably get to Miami Beach? Answer = Empirical Formula Percent composition data for a compound made of Carbon, Fluorine and chlorine by mass is the following: carbon = 9.933%, 58.63% chlorine, and 31.44% fluorine. Based on these data, what is the empirical formula of the compound? Formula -? 10096

Answer 1

Answers 1a) Mass of the Rock és : 229 groms, and it has volume of 863 ml know Density Mass wlume 729 grams 863 ml = 0.84 g/ml D = 0.84 g/cm Ocean of this reach epto US (6) Salt water of the is mone dense the compare to density госk - The density of Salt water 1.05 This think makes that the g/ml rock floated to the coast and then got because washed of its the beach to cup low

Carbon, Fluorine 2. The compound consists of chlorine . and Mass Carbon 9.933.9% chlorine - 58.63% mass percent of percent of percent of Fluorcine = 31.44 % mass assume that the * If percentages are loo so that total ma 55 given grams the mass of each element each element the percent given of each mass to convert Now have wo into moles the equation element using Ginen mass Dumber of moles molar ma 55 of moles of carbon of moles of chlorine: 58.639 no 9.9339 =0.8275 mols 129 1.6538 mois 6.45g of fluorine = 31.449 1.6547 mois Tag 35. no. of moles

Now have to convert these molar reation of a and F into smallest whole number ratios of elements which will be the Emperical Formula The streategy is to (a) Diride all the numbers by the smallest number (so that all numbers will be greater than a (b) Multiply an numbers by factor to eliminate fractions. a 0.89.75 mois of a ± 0.8275 = 1 2 1.6538 mds of a = 0.8295 = 1.99 ~ 1.65 47 mols of F = 0.8275=1.99 ~ 2 nerol no to further multiply the Here numbers але rounded to nearest They whole numberus. So Dier Empericar formula will be GC₂E2