How many moles do 8.1xx10^18 calcium atoms represent?

1 Answer
Jan 30, 2016

Approx. 1/100000"th" of a mole.

Explanation:

In 1 mol of particles there are 6.022 xx 10^23 individual particles. So we just divide the quoted number by this, Avogadro's number, to get an answer in mol.

(8.1xx10^18" calcium atoms")/(6.022xx10^23 " calcium atoms"*mol^-1) = ?? mol

What is the mass of this number of calcium atoms?