Question

How many Na atoms are there in 0.5 mole of Na2CO3?

Answer 1

Answer:

6.022 * 10^23

Explanation:

One mole of Na2CO3 contains 2 moles of Na

So half mole will give one mole Na atoms!

Answer 2

QUESTION

How many Na atoms are there in 0.5 mole of Na2CO3?

ANSWER

STEP 1 –In a molecule of Na2CO3, there are 2 atoms of Na, 1 atom of C and 3 atoms of O out of a total of 6 atoms. Thus ratio of atoms are 2:1:3

STEP 2–In a mole of a any compound, there are exactly 6.023 x 10²³ molecules. Thus in 0.5 moles you have 3.0015 x 10²³ molecules of $\bold{Na_2CO_3}$.

Thus combining step 1 and 2, we see that,

$\bold{No. \:of\: Na \:atoms = 2/6 × 3.0015 x 10^{23}}$$\bold{ = 1.0005 × 10^{23}}$

$\bold{No.\: of \:C\: atoms = 1/6 × 3.0015 x 10^{23}}$$\bold{= 5.0025 × 10^{22}}$

$\bold{No. \:of\: O\: atoms = 3/6 × 3.0015 x 10^{23}}$ $\bold{= 1.50075 × 10^{23}}$