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How many moles are in 25.0 mL of C2H6O? The density of C2H6O is 0.785 h/mL.
Hint: use formula: mass = density x volume. )

Respuesta :

cristisp93

0.4266 moles of C₂H₆O

Explanation:

The problems asks for the number of moles in 25 mL of C₂H₆O with a density of 0.785 g/mL.

First we calculate the mass of C₂H₆O:

density = mass / volume

mass of C₂H₆O = density × volume

mass of C₂H₆O = 0.785 × 25

mass of C₂H₆O = 19.625 g

Now we calculate the number of moles of C₂H₆O:

number of moles =  mass / molecular weight

number of moles of C₂H₆O = 19.625 / 46

number of moles of C₂H₆O = 0.4266 moles

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