How many moles are there in 81 grams of gold?

Answer 1

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 compound in one mole - this will provide you with a conversion factor. So take the measurement in grams and divide it by the molecular weight to convert to moles. Really what you're doing is multiplying the number by 1 mole, and dividing 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 .4886 moles MgSO3.

Answer 2

To do this, you need to know the atomic weight of the element you're dealing with, found on any periodic table. The atomic 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 grams and divide it by the atomic weight to convert to moles. Really what you're doing is multiplying the number by 1 mole, and dividing it by the equivalent of one mole, the atomic weight. That's the thought process behind unit analysis and how you get your "units to cancel".
In this case, the answer is about .4112 moles Au.

Answer 3

Step 1: Find out Atomic Mass of gold

From periodic table, atomic mass of gold, Au is 197.

Step 2: Apply formula to calculate moles

Amount of Au

= mass of sample / atomic mass of Au

= 51.06 / 197

= 0.259mol

Hence there is 0.259 moles of gold present in a 51.06g pure sample.

Answer 4

51.06 g (6.02 x 1023 atoms) / (196.97 g) = 1.56 x 1023 atoms Au

Answer 5

25,36 of grams of gold is equivalent to 0,129 moles.

Answer 6

1 g of gold is equal to 0,005 mol.