Superscript 15
How many moles of Pb is 9.3 X 1015 atoms of pb?
1 mol of Pb atoms will contain 6.02 x 10^23 atoms of Pb.
So 9.3 x 10^15 atoms x (1 mol/6.02 x 10^23 atoms) = ?
note how the unit "atoms" cancel leaving mol and that is the unit we want.
thanks What is the molar mass of ethane, C2H6?
C'mon now. (2*12)+(6*1)=??
thanks..alot
To find the molar mass of ethane (C2H6), we need to multiply the atomic mass of each element by its respective subscript and then add them up.
The atomic mass of carbon (C) is around 12 grams per mole, and there are two carbon atoms in ethane. So, (2 * 12) = 24 grams.
The atomic mass of hydrogen (H) is approximately 1 gram per mole, and there are six hydrogen atoms in ethane. So, (6 * 1) = 6 grams.
Now, we can add the individual masses together: 24 grams + 6 grams = 30 grams per mole.
Therefore, the molar mass of ethane is 30 grams per mole.