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Answer:

For example: H2O has two hydrogens and one oxygen. The atomic mass of hydrogen is 1.0078 and the atomic mass of oxygen is 15.999, so the mass of a mole of water is 2 x 1.0078 + 15.999. Therefore, a mole of water, or 6.022 x 1023 molecules, weighs 18.0146 grams.

Explanation:

brainliest please
A mole of water has 6.022 x 1023 water molecules. U times those 2 together to get ur answer

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