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sattari [20]
4 years ago
7

carbon has an average atomic mass of 12.011 amu (as given on the periodic table). Which isotope of carbon do you think is more a

bundant: carbon-12 or carbon-13? Explain your answer. Check your answer by using the sim to select carbon and clicking on "Nature's mix of isotopes".
Chemistry
1 answer:
boyakko [2]4 years ago
8 0

Carbon-12 would be most abundant because the amu is 12.011, indicating that the average leans toward the carbon-12 isotope instead of the carbon-13 isotope. If the amu would have been 12.99, you could say that carbon-13 is more aboundant becasue the average is closer to the carbon-13 isotope.

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A 51.24-g sample of Ba(OH)2 is dissolved in enough water to make 1.20 liters of solution. How many mL of this solution must be d
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Answer:

0.40 L

Explanation:

Calculation of the moles of Ba(OH)_2 as:-

Mass = 51.24 g

Molar mass of Ba(OH)_2 = 171.34 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles= \frac{51.24\ g}{171.34\ g/mol}

Moles= 0.2991\ mol

Volume = 1.20 L

The expression for the molarity is:

Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}

Molarity=\frac{0.2991\ mol}{1.20\ L}=0.24925\ M

Thus,

Considering

Molarity_{working\ solution}\times Volume_{working\ solution}=Molarity_{stock\ solution}\times Volume_{stock\ solution}

Given  that:

Molarity_{working\ solution}=0.100\ M

Volume_{working\ solution}=1\ L

Volume_{stock\ solution}=?

Molarity_{stock\ solution}=0.24925\ M

So,  

0.100\ M\times 1\ L=0.24925\ M\times Volume_{stock\ solution}

Volume_{stock\ solution}=\frac{0.100\times 1}{0.24925}\ L=0.40\ L

<u>The volume of 0.24925M stock solution added = 0.40 L </u>

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Answer:

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