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A thimble of water contains 4.0 x 10^21 molecules . The number of moles of H2O is: a. 6.6 x 10^-23 b. 2.4 x 10^-23 c. 6.6 x 10^-3 d. 2.4 x 10^45 e. 2.4 x 10^23