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To determine this, we must first find the molar mass of H2O which is 18.01528 g/mol. (Take the Atomic Mass of H X2 since 2 H atoms present, + atomic mass of O).

Then we must divide mass by molar mass.

So, n= 1.00g/18.01528g/mol

n= 0.055508 mol

earlier responses gave answer to fewer decimal points, users should give number of significant figures relevant to their application

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