How many moles (of molecules or formula units) are in each sample? Part A 36.02

Question

How many moles (of molecules or formula units) are in each sample?

Part A 36.02 g CF2Cl2 Express your answer to four significant figures and include the appropriate units. IA ncF,a,ValueUnits Value Submit My Answers Give Up Part B 26.7 kg Fe (NO3) 2 Express your answer to three significant figures and include the appropriate units. IA Value Units nFe(NOs),- Value Units Submit My Answers Give Up Part C 0.3167 g CsH18 Express your answer to four significant figures and include the appropriate units. IA 0? nc.HValueUnits Submit My Answers Give Up

Explanation / Answer

ANSWER

No. of moles = given mass / Molar mass

No. of moles of molecules or formulla unite = No. of moles

No. of molecules or formulla units = Na X No. of moles

Na = Avagadroes Number.

(A) CF2Cl2

No. of moles of CF2 Cl2 = 36.02 / 120.91 = 0.2979 moles

(B) 26.7Kg of Fe((NO3)2

26.7 Kg = 26.7 X 1000 = 26700g

No. of moles of Fe((NO3)2 = 26700 / 179.85 = 148 moles

(C) C8H18

No. of moles of C8H18 = 0.3167 / 114.15 = 0.0028 moles

(D) 111Kg of CaO

111 Kg = 111 X 1000 = 111000g

No. of moles of CaO = 111000 / 56.07 = 1979.66 moles = 1.98 X 103 Moles ( Only 3 significant figures)

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