Calculate the density of a pure substance if 100cm cubed of it has a mass of 20 grams​

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He latent heat of vaporization for ethyl alcohol is 854 j/g. the amount of energy, rounded to the nearest whole number, needed to change 5.20 grams of ethyl alcohol from a liquid to a gas is

If you put a helium-filled balloon in the refrigerator, what will happen?