If you have 20g of C, How many atoms of C do you have?

Question

Hey, I'm really confused, the question is for a grade and the teacher didn't show how to explain it, anyone know how to solve it? and explain it? to help me out? Please and thanks... ALOT!

buh was da answa?

AHH THANKS! yea im not in my 4th.. im in first.. im a freshman.. and in honors science...thanks SO much

Answer 1

Unless you are in the 4th year of AP physics you couldn't possibly expected to know this. The teacher wanted to challenge you to research this. You did.

Here's the detail.

It's called The Avogadro constant (symbols: L, NA), also called the Avogadro number is the number of "entities" (usually, atoms or molecules) in one mole,that is the number of carbon-12 atoms in 12 grams (0.012 kg) of unbound carbon-12 in its ground state. The current best estimate of this number is one of the constants of Chemistry. Amadeo Avogadro determined that there were 6.02 x 10 23 atoms in one mole of any substance.

The number of molecules in a mole of a substance ( 6.02 x 10 23 = approximately 602,250,000,000,000,000,000,000)

Just tell the teacher this:

The anwser lies in the formula for Avogadro's number and that is 6.02 x 10 to the 23rd eqauls 12 grams of carbon so 20 grams would equal approximately 2 moles or 12,05,000.000,000,000,000,000,000 molecules of carbon..

Answer 2

1 mol = Avogadro's number = 6.02*10^23
1 mol c = 12 g;
20 g = 20/12 = 1.666(6) mol
1.666(6)*6.02*10^23 = 10.03(3)*10^23 atoms --->
1 003 333 333 333 333 333 333 333 atoms