Question

What is the number of molecules of 180 g of NO₂ ?

Answer 1

To find the number of molecules, calculate the number of moles using the mass and molar mass. Then, use Avogadro's number to convert moles to molecules. Therefore we get 2.354 × 10^24 molecules.

Step-by-step explanation:

The number of molecules can be determined using Avogadro's number.

1 mole of any substance contains 6.022 × 10^23 molecules.

First, we need to calculate the number of moles of NO₂ in 180 g:

180 g / 46 g/mol = 3.913 moles of NO₂

Next, we can convert moles to molecules:

3.913 mol × 6.022 × 10^23 molecules/mol = 2.354 × 10^24 molecules