What is the weight of the ethyl alcohol that exactly fills a 200.0 mL container?

The density of ethyl alcohol is 0.789 g/mL.

1 Answer
Aug 17, 2016

Answer:

#158g#

Explanation:

To calculate the "weight" (mass) of ethyl alcohol, we have to use this formula:
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- Density will have units of #g/(mL)# when dealing with a liquid or units of #g/(cm^3)# when dealing with a solid.

  • The mass has units of grams, #g#.

  • The volume will have units of #mL# or #cm^3#

We are given the density and volume, both of which have good units so all we have to do is rearrange the equation to solve for the mass:

#densityxxvolume=(mass)/(cancel"volume")xxcancel"volume"#

#color(green)("Density")##xx##color(green)("Volume = Mass")#

#(0.789g)/cancel"mL"xx200.0cancel"mL"#

Thus, ethyl alcohol weighs 158g.