13) If a 25 kg LPG tank is 30% butane (C4H10) , how many molecules of butane are contained in the tank? A) 2.60 x 1023 molecules B) 2.60 x 1026 molecules C) 7.79 x 1019 molecules D) 7.79 x 1022 molecules E) 7.79 x 1025 molecules
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