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Alborosie
2 years ago
10

Magnesium has three naturally occurring isotopes. 24Mg (isotopic mass 23.9850 arnu. abundance 78.99%). 25Mg Osotypic mass 24.985

8 amu, abundance 10.00%), and 26Mg Osotopic mass 25.9826 amu, abundance 11.01%). Calculate the atomic mass of magnesium.
Chemistry
1 answer:
ehidna [41]2 years ago
3 0

Answer:

24.3049 amu

Explanation:

Atomic mass of magnesium = percentage average of its isotopes

= 23.9850 x .7899 + 24.9858 x 0.10 + 25.9826 x .1101

= 24.3049 amu

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3 years ago
As a "rule of thumb" there are 20 drops of a liquid in a mL. Using this estimate and a density of 1.685, how many moles are in 2
arlik [135]

Answer:

0.020 mol

Explanation:

Let's consider the following relations:

  • 20 drops of a liquid have a volume of 1 mL.
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With these relations, we can calculate the moles of phosphoric acid in 27 drops of solution.

27drop \times \frac{1mL}{20drop} \times \frac{1.685gSolution}{1mL} \times \frac{85gH_3PO_4}{100gSolution} \times \frac{1molH_3PO_4}{97.99gH_3PO_4} = 0.020 mol

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2 years ago
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Answer:

okkkkk

Explanation:

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