How many atoms are contained in 6.75 moles of C2H6?

Answer 1

6.02 X 1023 particles per mole X .75 moles = 4.52 X 1023 molecules.

Answer 2

To do this, you need to know the molecular weight of the element you're dealing with, by adding up the atomic weights of the elements involved (found on any Periodic Table). The molecular weight is the mass in grams of the element in one mole - this will provide you with a conversion factor. So take the measurement in moles and multiply it by the atomic weight to convert to grams. Really what you're doing is dividing the number by 1 mole, and multiplying it by the equivalent of one mole, the molecular weight. That's the thought process behind unit analysis and how you get your "units to cancel".
In this case, the answer is about 80.5 grams C2H6O.

Answer 3

This conversion requires a specific element. To convert moles to gram, you need to take the number of moles and multiply it by the Atomic Mass. If you do not have the atomic mass, you cannot go from moles to gram or grams to moles.

Answer 4

6.75 moles of C2H6 contain 4.08 x 10^24 atoms. This is calculated by multiplying Avogadro's number (6.022 x 10^23 atoms/mole) by the number of moles.

Answer 5

There are 6.25 moles of C-12 in 75g of C-12.

Answer 6

Quite a few!

6.75 moles C2H6 (6.022 X 10^23/1 mole C2H6)

= 4.06 X 10^24 atoms

Answer 7

1 mole H2O = 18.0153g H2O

75g H2O x (1mol H2O/18.0153g H2O) = 4.2mol H2O

Answer 8

1 mole CO2 = 6.022 x 1023 molecules

1.75mol CO2 x 6.022 x 1023 molecules/mol = 1.05 x 1024 molecules CO2

Answer 9

Molar mass of water is 18gmol-1. so there are 13.5 grams.

Answer 10

76 (g) over 12.0 (g/mol) = 6.3 mol