Calculate the number of mole in 15g of ethane.
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Explanation:
To calculate your mole fraction, divide the mass of your sample (15 grams) by the mass of a mole (32 grams) and your calculator will say 0.46875. That is your mole fraction. Multiply that times Avogadro's number and you get 2.82 x 10^23 molecules of ethane in a 15 gram sample.
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