posted by Summer .
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 ?
0.155gx46.0 = moles
moles x 6.02 E23 = answer
Part 1 Answer: 2030000000000000000000
Part 2: How many atoms of N do you have ?
3 total parts, 1 part is N
So take first answer x 1
Part 2 Answer: 2030000000000000000000
Part 3: How many atoms of O do you have?
3 total parts, 2 parts are O
So take first answer x 2
Part 3: 4060000000000000000000
Part 4: What is the % by mass of N?
Part 5: What is the % by mass of O?
I need help on Part 4 & 5, but you'll need the previous information to do the problem. Thank you if you can help.