Calculate the number of molecules present in 4g NaOH.

1.	Calculate the number of molecules present in 4g NaOH.
Answer» > No. of moles of NaOH is given by n=(Given MASS)/(MOLAR mass) = 4/40 = 0.1 mol 1 mol has 6.022 × 10^23 molecules. Thus, 0.1 mol has 6.022 × 10^23 × 0.1 molecules i.e. 6.022 × 10^22 molecules.

Answer»

No. of moles of NaOH is given by

n=(Given MASS)/(MOLAR mass)

= 4/40 = 0.1 mol

1 mol has 6.022 × 10^23 molecules.

Thus, 0.1 mol has 6.022 × 10^23 × 0.1 molecules i.e. 6.022 × 10^22 molecules.

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