<u>Answer:</u>
<u>For 1:</u> 6.68 g of nitrogen dioxide will contain number of molecules
<u>For 2:</u> The given amount of nitrogen dioxide molecules has a mass of 41.31 g.
<u>Explanation:</u>
According to the mole concept:
1 mole of a compound contains number of molecules
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:
......(1)
- <u>For 1:</u>
We are given:
Mass of nitrogen dioxide = 6.68 g
Molar mass of nitrogen dioxide = 46 g/mol
Putting values in equation 1, we get:
Using above concept:
If 1 mole of a compound contains number of molecules
So, 0.145 moles of nitrogen dioxide will contain = number of molecules
Hence, 6.68 g of nitrogen dioxide will contain number of molecules
- <u>For 2:</u>
We are given:
Molecules of nitrogen dioxide = molecules
Using the above concept:
If number of molecules are present in 1 mole of a compound
So, number of molecules will be present in =
moles of nitrogen dioxide
We know, molar mass of nitrogen dioxide = 46 g/mol
Using equation 1:
Hence, the given amount of nitrogen dioxide molecules has a mass of 41.31 g.