How many hydrogen MOLECULES are needed to produce 2 molecules of water (H2O)?

To produce one molecule of water 2 hydrogens are needed. So to find out how many hydrogens you need for two molecules of water, simply double your value. The answer is 4

4 Hydrogen molecules. you just count up the molecules and it’s 2 for each, so you multiply by two because there are two water molecules, so the answer would be 4

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