Question

The number of molecules in 32 g of methane is:​

Answer 1

Answer:

of moles of methane in 32 gram sample = 32/16 = 2 moles.

Answer 2

Given:

32 g of Methane.

To find:

Number of molecules in 32 g of methane.

Solution:

As we know that the molecular weight of CH4 is =12 + (1×4)= 16

Number of moles of a given compound =given mass /atomic mass = 32/16

Number of molecules = Number of moles × Na

Where Na = Avogadro's number = 6.023 × 10²³

Therefore, Number of molecules = (32/16) × 6.023×10²³

= 2 × 6.023×10²³

=12.046 × 10²³

Therefore, methane has 12.046×10²³ number of molecules in 32 g of methane.