Question

the molecular weight of NaOH is 40 find weight of 3 molecules in a.m.u​

Answer 1

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Very simple. Add all the molar masses of what composes sodium hydroxide (NaOH)

Na x 1 = 22.989 g/mol

O x 1 15.999 g/mol

H x 1 = 1.008 g/mol

Total molar mass of sodium hydroxide is

39.996 g/mol.

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