Question

how many moles are present in 11.5 g of sodium

Answer 1

no. of moles=given mass/atomic mass
                   =11.5/23(atomic mass of sodium=23g)
                   =1/2=0.5moles

Answer 2

There are 0.5 moles present in 11.5 g of sodium.

Explanation:

• The molar mass of Na is equal to 23g/mol.
• The formula to find out the number of moles is given by $\frac{weight}{molar mass}.$.
• Therefore the number of moles in 11.5g of sodium or Na is equal to $\frac{11.5}{23}$ which gives us 0.5.
• Now to further find out the value of the amount of the atoms present in it then we multiply the total number of given moles in it to the Avogadro number which is $6.022\times 10^2^3$ therefore $0.3\times6.022\times10^2^3$ is $3.011\times10^2^3.$.

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