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Lera25 [3.4K]
3 years ago
6

What percentages of atoms are heavier than hydrogen and helieum?

Chemistry
1 answer:
jeka57 [31]3 years ago
3 0
Look at a periodic table. Ptable.com is great. Amu= g/mol which is found under the symbol. divide the number heavier by the total and multiply by 100 to get percent.
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A chemist prepares a solution of magnesium fluoride MgF2 by measuring out 0.0113μmol of magnesium fluoride into a 450.mL volumet
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Answer:

2.51x10⁻⁵ mmol MgF2/L

Explanation:

To find the concentration in mmol / L we need to convert μmol to mmol (1000μmol / 1mmol) and mL to Liters (1000mL / 1L) as follows:

μmol MgF2:

0.0113μmol MgF2 * (1mmol / 1000μmol) = 1.13x10⁻⁵ mmol MgF2

Liters solution:

450mL * (1L / 1000mL) = 0.450L

Concentration in mmol/L:

1.13x10⁻⁵ mmol MgF2 / 0.450L =

<h3>2.51x10⁻⁵ mmol MgF2/L</h3>
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