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How many helium atoms are contained in 3.75 moles of helium? a) 1.61 x 10^23 helium atoms b) 6.50 x 10^25 helium atoms c) 1.23 x 10^24 helium atoms d) 2.26 x 10^24 helium atoms e) 9.03 x 10^24 helium atoms