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how many grams of h2o do you need to weigh out to have 1 mole of h2o?
i really need with

The formula for moles to grams is: # of moles (in mol) x molar mass (in g/mol) = mass (in g). The molar mass of H2O, or water, is 18.01528g/mol. We can now plug in the values we know and get our answer. 1mol x 18.01528g/mol = 18.01528g of H2O.

Hope this helps!

They carry out the exchange of gases as we breathe ( oxygen and carbon dioxide).