# Atoms and molecules

1. Jan 17, 2010

### SAT2400

1. The problem statement, all variables and given/known data
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?

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

3. The attempt at a solution
1 x 10^23 atoms( I didn't get this answer)

2. Jan 17, 2010

### ideasrule

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

3. Jan 17, 2010

### SAT2400

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

4. Jan 17, 2010

### ideasrule

Water is H2O, two hydrogen atoms and one oxygen atom

5. Jan 17, 2010

### ideasrule

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

6. Jan 17, 2010

### 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..

7. Jan 17, 2010

### ideasrule

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