Calculate the mass percent of water in CaCrO4.H2O

Between 2014 and 2016, more than 25,000 children in flint, michigan, drank water that was contaminated with lead from lead pipes. during this time, the city claimed the water was safe to drink. which of these actions could the city have taken to ensure that the drinking water was free from lead?

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The melting point of sulfur is 115 °c and its boiling point is 445 °c. what state would sulfur be in at 200 °c?