a student determines that a 9.8 mixture of MgCl2 and NaNO3 contains 0.050 mol of MgCl2. What is the percent of Cl in the mixture?

18

Pretty sure it's d. heterogeneous is separated by physical properties. 

The surface of the water droplet is held together by the attraction between molecules. in order for water to flow more easily into these small spaces, you need to decrease its surface tension. you can do this by adding soap, which is a surfactant (a material that decreases the surface tension of a liquid).

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