MasteringChemistry: Chapter 4 Part 2 - Google Chrome Secure ! https:/ session.ma

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MasteringChemistry: Chapter 4 Part 2 - Google Chrome Secure ! https:/ session.masteringchemistry.com/myct/itemView?assignmentProblemiD-91167139&offsetenext; Chapter 4-Part2Item 9 Resourcas You completed this assignment. previous | 9 of 28 | next » Item 9 Part A A mixture of NaCl and NaBr has a mass of 2.03 g and is found to contain 0.72 g of Na What is the mass of NaBr in the mixture? Express your answer using two significant figures. mNar0.46 g Submit My Answers Give Up All attempts used; correct answer displayed Continue 12:59 AM O Type here to search

Explanation / Answer

let, mass of NaBr = x
mass of NaCl = y

Set equations:

x + y = 2.03 g
(x) (23 / 102.9) + (y) (23/ 55.8) = 0.72

(22.99 / 102.9) ---> the decimal fraction of Na in NaBr
(22.99 / 55.8) ---> the decimal fraction of Na in NaCl

Solve for y:

y = 2.03 - x

Substitute:

(x) (23 / 102.9) + (2.03 - x) (23 / 55.8) = 0.72

solving for x, gives x = 0.618 g
Mass of NaBr in the mixture = 0.618 grams = 0.62 gms

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