L. Co the one alternative that best completes the statement or answers the quest

Question

L. Co the one alternative that best completes the statement or answers the question. 1) Determine the density of an i object that has a mass of 149.8 g and displaces 121 mL of water when A) 1.38 g/mL. B4gm 8.0/m D) 18.1 g/ml. E12.4 g/ml 2) A mixture of 0.220 moles Rn, 0.350 moles 02 and 0.640 moles Ar has a total pressure of 2.95 atm. placed in a graduated cylinder 2) - What is the partial pressure of O2? B) 0.969 atm A) 1.03 atm C) 0.853 atm D) 0.649 atm E) 1.17 atm 3) 3) How many gold atoms are contained in 3.75 moles of gold? A) 9.03 1025 gold atoms B) 6.50 1025 gold atoms C 1.23 1024 gold atoms D) 2.26 x 1023 gold atoms E) 2.26x 1024 gold atoms

Explanation / Answer

1) density(d) = mass/volume

              = 149.8/12.1

              = 12.38 g/ml

answer: E

2) partial pressure of O2(pO2) = Xo2*ptotal

       Xo2 = 0.35/(0.22+0.64+0.35) = 0.29

   pO2 = 0.29*2.95 = 0.855 atm

answer: C

3) no of atoms = 3.75*6.023*10^23

         = 2.26*10^24

answer: E

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