Question

2
d) law of con
How many moles are present in 11.5 g of sodium ?
(a) 0.5 mol
(b) 5.0 mol
(c) 0.05 mol
(d) 1.5 mol
of the following the valency of each of the​

Answer 1

Answer:

(a) 0.5 molecular

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}.

molarmass

weight

. .

Therefore the number of moles in 11.5g of sodium or Na is equal to \frac{11.5}{23}

23

11.5

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 $$3.011\times10^2^3.$$ .