Solving Atoms & Molecules: 1.00g Water/Ice Cube

[SAT2400]

Homework Statement

A cubic centimeter of water has a mass of 1.00g. How many molecules does it contain?
How many atoms are in 1.00g ice cube?

Homework Equations

1 mole=6.02 x 10^23 molecules(or atoms)
1 mole of H20= 18g

The Attempt at a Solution

The answers are: 3.3 x10^22 molecules.( I got this answer)
1 x 10^23 atoms( I didn't get this answer)

Please help! Thanks!

 

[ideasrule]

So if 18 g of water has 6.02*10^23 molecules, how many does 1 g have?

 

[SAT2400]

1g has 3.3 x 10^22 molecules..
how do i find the atoms?

 

[ideasrule]

Water is H2O, two hydrogen atoms and one oxygen atom

 

[ideasrule]

BTW, did you get 2400 on the SAT? If so, congrats!

 

[SAT2400]

no...that's the dream score..lol

Ok..how do you get 1x 10^23 atoms?? for the second question?
i got the answer for the 1st question..

 

[ideasrule]

You don't. 1*10^23 is the wrong answer. Somebody screwed up and divided by 3 instead of multiplying by 3.