Question

Find the number of electron in 46 gram of Na .

Answer 1

2 moles

No of moles = known mass of a substance/ molar mass of the substance. So in 46 grams, 2 moles of Na are present.

Answer 2

Answer:

The number of electrons in 46g of sodium is equal to 132× 10²³electrons.

Explanation:

Given: the mass of sodium atom = 46g

We know, the atomic mass of sodium = 23g

The one mole of sodium contains 6.023 ×10²³ atoms.

23 g of sodium will have $= 6.023*10^{23}atoms$

46grams  of sodium contain $=\frac{6.023*10^{23}}{23}*46$

                                               $=12.046*10^{23}$ atoms of Na

One atom of sodium contains $=11$ electrons

$12.046*10^{23}$ atoms of sodium contain $=12.046*10^{23}*11$

                                                              $=132.5*10^{23}$ electrons

Therefore, the number of electrons in 46g of Na is 132×10²³.