Answer: 20.2
Explanation:
Mass of isotope 1 = 20
% abundance of isotope 1 = 90.5% =
Mass of isotope 2 = 22
% abundance of isotope 2 = 8.0% =
Mass of isotope 3 = 23
% abundance of isotope 3 = 1.5% =
Formula used for average atomic mass of an element :
Therefore, the average atomic mass of the element is 20.2.
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Answer:
a. Approximately .
b. Approximately .
Explanation:
The unit of concentration "" is equivalent to "", which means "moles per liter."
However, the volume of both solutions were given in mililiters . Convert these volumes to liters:
.
.
In a solution of volume where the concentration of a solute is , there would be (moles of) formula units of this solute.
Calculate the number of moles of formula units in each of the two solutions:
Solution in a.:
.
Solution in b.:
.
What volume of that (same as ) solution would contain that many
For the solution in a.:
.
Convert the unit of that volume to milliliters:
.
Similarly, for the solution in b.:
.
Convert the unit of that volume to milliliters:
.