Double number of moles of water have been formed if the amount of H2 is doubled.
If the amount of H2 is doubled, double moles of H2O would have formed because one mole of H2 is needed for the formation of one mole of water. The amount of water is related to the presence of hydrogen. If five moles of hydrogen if available then five moles of water can be produced.
Similarly, if ten moles of hydrogen if available then ten moles of water can be produced so we can conclude that double number of moles of water have been formed if the amount of H2 is doubled.
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