# chemistry

posted by .

are these right?

How many atoms are there in 1.3x10^22 molecules NO2?

atoms=(1.3x10^22 molecules NO2) x (2atoms/1molecule) = 2.6x10^22 atoms NO2

A 5.0g sample of O2 is in a container at STP. How many atoms of oxygen are in the container?

atoms = (5.0g O2) x (1mol/32g)x (6.02x10^23 molecules/1mol) x (2atoms/1mol) = 1.9x10^23 atoms O2

thanks

• chemistry -

I didn't check the math but #2 is worked correctly. #1 is not correct. The question asks for the number of atoms and there are three atoms per molecule of NO2; i.e., 1 N atom and 2 O atoms = 3 atoms total.

• chemistry -

thank you!

## Similar Questions

1. ### chemistry - ozone

hi, can anybody tell me the molecules that destroy ozone?
2. ### CHEMISTRY

what is the symbol for chromium (II) sulfate?
3. ### chem

i need to convert the following number of atoms into grams d. 1 million atoms of Br bromine e. 3x10^23 atoms of Ne neon
4. ### chemistry

Determine the number of moles of a) N atoms in 42.5g of Mg(NO3)2 b) N atoms in a sample of C7H5(NO2)3 that has the same number of O atoms as 12.6g C6H12O6
5. ### chemistry

Determine the number of moles of N atoms in a sample of C7H5(NO2)3 that has the same number of O atoms as 12.6g C6H12O6
6. ### chemistry.

They are__________Mol of carbon atoms in 4 mol of Dimedthysulfoxide A: 2 B: 6 c: 8 D: 4 E: 3 My answer is C:8 but can any one help me with the method to show the right answer. 2. There are ___________Sulfur atoms in 25 molecules of …
7. ### Chemistry

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 ?
8. ### Chemistry

Part 1: 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 ?
9. ### Chemistry

Part 1: 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 ?
10. ### Chemistry

How many atoms are present in a sample of 2.0 x 10^23 molecules of C7H5(NO2)3?

More Similar Questions