Each molecule of NO2, nitrogen dioxide, consists of 1 atom of N and 2 atoms of O. If you have 0.155 g. of NO2, how many molecules of NO2 do you have ?
If you could, please include steps as to how to do the problem.
Thank you
How many moles NO2 do you have? That is grams/molar mass = 0.155/46.0 = about 0.003 (but you need to do it more accurately).
1 mole NO2 contains how many molecules NO2. 1 mole of NO2 contains 6.022E23 molecules; so how many molecules NO2 do you have? That is 0.003 moles NO2 x (6.022EE23 molecules/mole) = about 2E21.
Thank you :)
2030000000000000000000 was the correct answer
Part 2:
How many atoms of N do you have ?
Many profs will count your answer as incorrect. By placing that many zeros after the number you indicate there are 21 significant figures and that isn't correct. There are only 3 (dictated by the 0.155 gram in the initial sample) so the correct way to show this is 2.03E21.
For the correct number of N atoms, there is 1 N per NO2 molecule; therefore, the number of atoms N is the same as the number of molecules of NO2. There will be twice that number for the number of O atoms.
Our work is online, and I tried to enter it as 2.03E21 and it would not accept it.
It only accepts the answer if everything is correct.
Thank you :)
OK. I suppose you play the game the way it works; however, 2.03E21 is the correct way of writing that number.
Than you can be the one to tell my prof that, sir :)
To determine the number of molecules in 0.155 g of NO2, we need to follow these steps:
Step 1: Calculate the molar mass of NO2.
The molar mass of NO2 can be calculated by adding the atomic masses of nitrogen (N) and two oxygen (O) atoms.
- The atomic mass of N is 14.01 g/mol.
- The atomic mass of O is 16.00 g/mol.
Molar mass of NO2 = 14.01 g/mol + 2 * 16.00 g/mol = 46.01 g/mol.
Step 2: Convert grams to moles.
To convert the given mass (0.155 g) to moles, divide it by the molar mass (46.01 g/mol).
Number of moles = 0.155 g / 46.01 g/mol = 0.003369 mol.
Step 3: Apply Avogadro's number.
Using Avogadro's number, which is 6.022 x 10^23 molecules/mol, we can calculate the number of molecules in the given number of moles.
Number of molecules = 0.003369 mol * (6.022 x 10^23 molecules/mol)
= 2.027 x 10^21 molecules.
Therefore, you have approximately 2.027 x 10^21 molecules of NO2 in 0.155 g of the compound.