17. 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?

Answers

Answer 1

Answer: 17) mol of $H_(2)O$ = $(no. of molecule)/(L)$
= $(1000 molecules)/(6.03 * 10^(23) molecules/mol )$
= 1.658 *    $10^(-21) mol$

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

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