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  1. How many moles are there in a sample containing 1000 molecules of H2O?18. If you wanted a sample of H2O containing 6 x 23molecules, how could you measapproximate number without counting?

How many moles are there in a sample containing 1000 molecules of H2O?18. If you wanted a sample of H2O containing 6 x 23molecules, how could you measapproximat class=

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JoshEast

17) mol of \(H_{2}O\) = \(\frac{no. of molecule}{L}\)
                            = \(\frac{1000 molecules}{6.03 * 10^{23} molecules/mol }\)
                            = 1.658  *   \(10^{-21} mol\)

18) mol = \(\frac{molecule}{L}\)
      \(\frac{Mass}{Mr} = \frac{Molecule}{L}\)
      Let mass of oxygen = x
      \(\frac{x}{(2 * 1) + (16)} = \frac{6 * 10^{23} }{6.03 * 10^{23} }\)
      \(x = (6 * 10^{23} ) (18 g/ mol)\)
             =  17.9 g

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