ll T-Mobile LTE 8:34 PM * 391600 session.masteringchemistry.com C Chapter 7 HW P

Question

ll T-Mobile LTE 8:34 PM * 391600 session.masteringchemistry.com C Chapter 7 HW Part A How many molecules are in 0.480 mole of lactic acid? Express your answer using three significant figures. Part B How many atoms of carbon are in 1.20 moles of lactic acid? Express your answer using three significant figures. N 5.98-10 Previous Answer Request Answer X Incomect One attempt remaining: Try Again -Part C How many moles of lactic acid contain 470×10" atoms of O? Express your answer using two significant figures Part D What is the molar mass of lactic acid? Express your answer using three significant figures. Previous Answers Conrect Provide Feedback

Explanation / Answer

part B

lactic acid formula : C3H6O3

1 mol lactic acid = 3 mol C

so that, No of mol of C in 1.2 mol lactict acid = 1.2*3/1 = 3.6 mol

1 mol = 6.023*10^23 atoms

No of C atoms present = 3.6*6.023*10^23

   = 2.17*10^24

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