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Into how many systems are crystals classified?
Weegy: There are 7 different crystal systems, they are: (1) cubic (2)tetragonal, (3) hexagonal, (4) trigonal, (5) Orthorhombic, (6) etc User: How many water molecules are in 48 formula units of calcium chloride dihydrate (CaCl2 2H2O)? Weegy: One formula unit of CaCl2.2H2O has 2 molecules of water. So, 39 formula units of CaCl2.2H2O will have 39 X 2 = 78 molecules of water. User: If the hydrogen ion concentration is 10 M^-7, what is the pH of the solution? Weegy: You can find the pH of a solution by doing the negative log of the molarity of H+ ions so, in this case doing -log(10^-7), pH comes out to be 7. (More)
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