find the mass of 1×10^24 molecules of water.
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First, find out how many moles of water you have. Divide the number of molecules by Avogadro's number (6.02 x 1023). That gives the number of moles. Then multiply the number of moles by the molecular weight of water. That will give the mass in grams of the water. Do you know how to find the molecular weight of water?
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