Question

calculate the total number of molecules present in 1.6g of methane

Answer 1

1mole of methane (16 grams) contains Avogadro number of molecules. 0.1moles of methane( 1.6grams) contains '0.1 x Avogadro number' of molecules. Thus 0.1 mole of CH₄ contains "10 x 0.1 x Avogadro number" of electrons. Therefore 1.6 grams of methane contains 6.022 x 10²³ electrons.

Answer 2

Given :

Mass of Methane (CH₄) = 1.6 gm

To Find :

Molecules present in 1.6 gm of methane

Solution :

We know, 1 mole of any gaseous substance contains 6.022 × 10²³ molecules at STP.

16 gm of Methane = 1 mole

So,

16 gm of methane contains 6.022 × 10²³ molecules

1.6 gm of methane contains  $\frac{6.022 * 10^2^3}{16}$ × 1.6 molecules

                                               =  6.022 × 10²² molecules

Therefore, 1.6 gm of methane contains 6.022 × 10²² molecules.