PlEASE CHECK MY ANSWERS! CHEM EASY problem #26 CONTINUED and #27

Chemistry
Tutor: None Selected Time limit: 1 Day

Feb 17th, 2015

  1. Then, 74 % (volume of atoms only) would be: 74 x 60.42 A3 / 100 = 44.71 A3

  2. V = 4/3 πr

    Thus, r = (V/ (4/3 π))1/3 = (3x44.71/4 π)1/3 = 2.202 A

  3. Density = m/V = 780.47 amu /60.42 A3

    1 amu = 1.66054 x 10-24 g

    Thus, 760 amu = 12.96 x 10-22 g, since in order to convert to grams: 760 amu x 1.66054 x 10-24 g / 1 amu = 12.96 x 10-22 g

    1 A3 = (10-8 )3 cm3

    Thus, 60.42 A3 in cm3 is = 60.42 A3 x (10-8 )3 cm3 / 1 A3 = 60.42x10-24 cm3

    Density = m/V = 12.96 x 10-22 g/60.42 A3 = 12.96 x 10-22 g / 60.42x10-24 cm3 = 21.45 g/ cm3

27. Your answers looks right.

Feb 17th, 2015

can you check 2 and 3

Feb 17th, 2015

what do you mean by 2 and 3?

Feb 17th, 2015

the ones you labeled 2 and 3, i got different answers. you had 2.202 and 21.45

Feb 17th, 2015

r3 = V / 1.33 π = (44.71 A3) / (1.33)(3.14) = 10.71A3

r = 3root of 10.71A3 = 2.2 A

Feb 17th, 2015

just tried other ways.... still comes out 2.2 A

You can check it by your calculator, it's easy.

Feb 17th, 2015

and if 2 is right, then 3 is correct accordingly

Feb 17th, 2015

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