# chem question

B

#### BodybldgDoc

How many atoms of carbon are in 4.00*10^-8 grams of C3H8?
A. 1.64*10^15
B. 2.34*10^11
C. 1.89*10^14
D. 4.66*10^2
E. 4.00*10^4

This is how i solved it. Can someone please tell me if its right?

4*10^-8 g of C3H8 * 1mol of C3H8/44g of C3H8 * 3mol of C/1mol of C3H8 * 6*10^23 atoms of C/1 mol of C =1.7*10^15

#### dat_student

##### Junior Member
10+ Year Member
5+ Year Member
How many atoms of carbon are in 4.00*10^-8 grams of C3H8?
A. 1.64*10^15
B. 2.34*10^11
C. 1.89*10^14
D. 4.66*10^2
E. 4.00*10^4

This is how i solved it. Can someone please tell me if its right?

4*10^-8 g of C3H8 * 1mol of C3H8/44g of C3H8 * 3mol of C/1mol of C3H8 * 6*10^23 atoms of C/1 mol of C =1.7*10^15

B

thanks

#### joonkimdds

##### Senior Member
10+ Year Member
7+ Year Member
How many atoms of carbon are in 4.00*10^-8 grams of C3H8?
A. 1.64*10^15
B. 2.34*10^11
C. 1.89*10^14
D. 4.66*10^2
E. 4.00*10^4

This is how i solved it. Can someone please tell me if its right?

4*10^-8 g of C3H8 * 1mol of C3H8/44g of C3H8 * 3mol of C/1mol of C3H8 * 6*10^23 atoms of C/1 mol of C =1.7*10^15

wrong~
and i believe this will give u the 1.64x10^15 so the A is the answer.
By the way, is #atom same as #molecules?
I know that there are 6.022x10^22 molecules in 1 mol but then that means
there should be the same amount of atoms

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