When dealing with large quantities of something, it is often convenient to defin
ID: 1787233 • Letter: W
Question
When dealing with large quantities of something, it is often convenient to define a term that refers to a certain quantity. For example, a dozen of anything is 12. If I buy 3 dozen doughnuts, I have purchased 3*12=36 doughnuts. In dealing with large quantities of molecules, the term mole refers to 6.022×1023 molecules. This number is referred to as Avogadro's Number. Suppose you have 4.64 moles of a certain type of molecule. How many molecules do you have? Submit Answer Tries 0/10 Using the idea of a dozen as an example again, if you have 2 dozen blocks and their total mass is 48 kg, the mass of one block would be 2.0 kg. Suppose you have a sample of 2.22 moles of a certain type of molecule and the total mass is 76.4 g. What is the mass of a single molecule?
Explanation / Answer
in 4.64 moles = 4.64 x 6.022 x 10^23
= 2.79 x 10^24 molecules .......Ans
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total molecules = 2.22 x 6.022 x 10^23
total mass =76.4 x 10^-3 kg
mass of 1 molecule = (76.4 x 10^-3) / (2.22 x 6.022 x 10^23)
= 5.715 x 10^-26 kg
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