Question

what is the most of one NH³ molecules (a) 2.8×10-²³g (b)1.4×10-²³g (c)5.6×10-²³g (d)7.0×10-²³g​

Answer 1

Answer:

One mole of any gas occupies about 22.4 litres of space at STP.

Also, I mole contains Avogadro's number of molecules.

So, one mole of NH3 occupies 22.4 litres and has 6.022 × 10^23 molecules.

Therefore 1 litre contains 1 ÷ 22.4 moles.

Thus:

10 litres contain 10 ÷ 22.4 moles.

Therefore :

10 litres contain about 0.446 moles of NH3.

Now for number of molecules:

1 mole of NH3 contains 6.022 × 10^23 molecules.

Thus 0.446 moles of NH3 contain 6.022 × 10^23 × 0.446 molecules

= 2.6851 × 10^23 molecules.

Multiply by 4 for number of atoms.

This gives final answer:

2.6851 × 4 × 10^23 ATOMS.