That would depend on the element or molecule. Use the atomic weights of each of the atoms in the molecule in question and add them together this gives you the molecular weight. Such as H2O (water) = 1.01 +1.01 +16.00 = 18.02 the units for this is grams per mole. To convert grams to moles you take the number of grams you have and divide it by the molecular weight of the molecule. If you had 2440 grams of water, you take 2440 grams/18.02 grams per mole and you get 135.405 moles of water. If you had 2440 grams of oxygen (O2), you would take 2440 grams/32.00 grams per mole and you get 76.25 moles of oxygen.
16 grams of oxygen how many moles is 0,5 moles.
53 grams ÷ 18.01 grams/mole = 2.94 moles
120 grams of calcium contain 2,994 moles.
1,8 grams of fluorine is equivalent to 0,0947 moles.
0.377 grams of Kr is equal to 0,0045 moles.
124 grams of ethane is equal to 4,124 moles.
320 grams of oxygen is the equivalent of 10 moles.
380.7 grams of iodineis equivalent to 3 moles.
370 grams of mercury is equal to 1,844 moles.
222,6 grams of iodine is equivalent to 1,754 moles.
180 grams of water is 10 moles of water.
2.83 moles