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Percentage Composition

Calculate the...

Question

Calculate the no of moles for following
I) 4gm $N a O H$

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Solution

Molecular mass of $N a O H = 40 g / m o l$
Hence $n o . o f m o l e s = \frac{w e i g h t i n g r a m s}{m o l e c u l a r w e i g h t} = \frac{4}{40} = 0.1$

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