Eli5 why Is water which is 66.6% Hydrogen great for firefighting even though Hydrogen is highly inflammable?
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a) Water isn’t 66.6% hydrogen. Hydrogen accounts for two grams of water’s eighteen-gram molar mass, so it’s more like 11.1%.
b) The hydrogens are covalently* bonded to the oxygen, so they aren’t free to participate in combustion reactions.
*They are labile though, but that doesn’t matter for this discussion.
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