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GUIDED SOLUTION uonnjos paping What mass (in grams) of chlorine is contained in each of the following samples? Be sure each of your answer entries has the correct number of significant figures. 2.52 x 1025 molecules of NCI3 7.80 x 1025 formula units of Ca(C102)2 Step 1 of 4 Part 1: In order to find the mass of an element from molecules of a compound, we first convert from molecules of compound to moles of compound using Avogadro's number v . From moles of compound, we convert to moles of the desired atom using the mole ratio . Finally, we convert from moles of element to mass of element using the molar mass Step 2 of 4 Skipped Be sure your answer has the correct number of significant figures. The entire problem can be put into a single calculation as follows. Determine the mass (in grams) of chlorine in 2.52 x 1025 molecules of NC13 1 mol NCI3 35 mol CI 35.446 g Cl 2.52 x 1023 NCly molecules x 6.022 x 1025 NCI3 molecules 1 mol NCI3 1 mol Cl g CI Correct Answer 1 molNel 3 met CI 35.446 g Cl 2.52 x 1025 NCL molecules x 6.022 x 1025 NCL, molecules 1 mol CI 4.45 x 105 g Cl 1 molNel, Step 3 of 4 Part 2: Determining the mass of a desired element from formula units of a compound is the same as Part 1. The conversion from formula units of a compound to moles of compound also requires | Avogadro's number Step 4 of 4 Skipped Be sure your answer has the correct number of significant figures. Determine the mass of chlorine in 7.80 x 10" formula units of Ca(C102)2. Terms of Use | Privacy Cen