Question

who many moles are present in 4g of sodium hydroxide
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Answer 1

molecular weight of NaOH is 40.

Given weight is 4 g

no of moles= weight/ molecular weight

= 4/40

= 0.1 moles

Answer 2

Moles = Given Mass÷molecular mass

moles=4÷NaoH

=4÷39.997

=0.10 (approx.)