How many g of H2O is present in 0.25 mil of it?
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In chemistry, a mole is a quantity unit that stands for the amount of a given substance. Since one mole of any chemical compound always contains 6.022 x 10^23 molecules, you can calculate the number of molecules of any substance if you know its mass and its chemical formula. The number 6.022 x 10^23 is called as the Avogadro constant.
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H2O has M.M=1×2+16=18g
25%of H2O
25/100×18=4.5 g
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