Question

If 3.0 moles of methane burn, how many molecules of methane are burned?

Options:
A) 6.02 x 10^23 molecules
B) 1.8 x 10^24 molecules
C) 9.0 x 10^24 molecules
D) 3.0 x 10^25 molecules

Answer 1

When 3.0 moles of methane burn, 1.8 × 1024 molecules of methane are burned, using Avogadro's number to convert moles to molecules the correct option is B).

Step-by-step explanation:

The question asks how many molecules of methane are burned when 3.0 moles of methane react. To find the number of molecules of a substance when given the number of moles, we use Avogadro's number, which is 6.022 × 1023 molecules/mol.

Using the relationship between moles and molecules, we calculate the number of methane molecules as follows:

1. Identify the number of moles of methane: 3.0 moles.
2. Multiply the number of moles by Avogadro's number to get the number of molecules:
   3.0 moles × 6.022 × 1023 molecules/mol = 1.8 × 1024 molecules of methane.

Therefore, when 3.0 moles of methane burn, 1.8 × 1024 molecules of methane are burned. The correct option is B) 1.8 × 1024 molecules.