A student pipets 5.00 ml of ethanol into a flask weighing 15.25 grams. She finds that the mass of the flask plus ethanol = 19.17 grams. Calculate the density of ethyl alcohol
A student pipets 5.00 ml of ethanol into a flask weighing 15.25 grams. She finds that the mass of the flask plus ethanol = 19.17 grams. Calculate the density of ethyl alcohol
Density=Mass/Volume
Since the mass of the flask with ethanol=19.17 grams, and without ethanol is 15.25 grams, then the mass of ethanol must be=19.17 - 15.25=3.92 grams. Since, she only had 5.00 ml of ethanol, which is the same as 5.00 cubic centimeters(since 1 ml=1cm^3) of ethanol.
So now we use our Density formula above:
Density=Mass/Volume=3.92g/5cm^3=.784 grams per cubic cm, which is the density of her ethanol.
