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Chemistry, 20.03.2021 20:40 bnnn

i just need an explanation :) so the problem was " what is the mass of 5 molecules of water(H2O) , in grams?" my teacher said the answer is 1.50 x 10^-22 but i dont understand why. why is it not 1.50 x 10^24, why is the exponent negative?

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i just need an explanation :) so the problem was " what is the mass of 5 molecules of water(H2O) ,...

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