Homework Help: Chemistry

Posted by Summer on Tuesday, June 14, 2011 at 4:00pm.

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.

Chemistry - Summer, Tuesday, June 14, 2011 at 4:11pm
Solved, Nevermind.
Chemistry - DrBob222, Tuesday, June 14, 2011 at 4:17pm
See my note at your original post about the number of significant figures.
Also, in this post note the typo on the first problem. moles = 0.155/46.0 and not 0.155 x 46.0

Answer this Question

Related Questions

Chemistry - Part 1: Each molecule of NO2, nitrogen dioxide, consists of 1 atom ...
Chemistry - Each molecule of NO2, nitrogen dioxide, consists of 1 atom of N and ...
chemistry - i have to write chemical formulas and balance them: nitrogen and ...
PHYSICS - A molecule consists of two atoms. The atoms have masses of 17 u and 14...
Inorganic chemistry - Nitrogen dioxide reacts with carbon monoxide to produce ...
physics - In ammonia (NH3) molecule, the three hydrogen atoms form an ...
Intro. Chemistry - Based on the law of definite composition, Dalton proposed ...
physics - A water molecule consists of an oxygen atom with two hydrogen atoms ...
chemistry - When nitrogen dioxide (NO2) from car exhaust combines w/ water in ...
Chemistry - Nitrogen Dioxide NO2 decomposes upon heating to form nitric oxide ...

For Further Reading

First Name:
School Subject:
Answer: