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Flura [38]
3 years ago
14

Lead (Pb) (average atomic mass 207.19 amu) has three naturally-occurring isotopes, Pb206, Pb207and Pb208 with isotopic masses of

205.98 amu, 206.98 amu and 207.98 amu respectively. If the isotopes Pb207and Pb208 are present in equal amounts, calculate the percent abundance of each isotope of Pb, which are, Pb206, Pb207 and Pb208.​
Chemistry
1 answer:
Dima020 [189]3 years ago
3 0

Answer:

pb am 207.19 amu

pb206, pb207and pb208

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Which of the following would increase the strength of an electromagnet? Check all that apply.
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Answer: The correct statements are ; A and B.

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Which statement indicates that a substance may be an ionic compound?
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4 years ago
This question has multiple parts. Work all the parts to get the most points. An aqueous antifreeze solution is 39.0% ethylene gl
nlexa [21]

Answer:

Molality = <u>10.300 m</u>

<u>Molarity = 6.5970 M</u>

<u>mole fraction = </u>0.156549

Explanation:

39.0 % = ethylene glycol

61.0 % = water

imagine the total mass = 100g

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61.0 % water = 61g

1) Molality = number of moles / mass of solvent (kg)

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<u />

<u>2) Molarity</u> = number of moles / volume of solution

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Molarity = 0.6283 moles / 0.09524 L = <u>6.5970 M</u>

3) Mole fraction

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Mole fraction = 0.6283/ 4.0134276 = 0.156549

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3 years ago
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