Taking Avogadro constant to be 6.022 X 1023
The no. corresponds to 1 mol Br atoms = 80 g(Approx)
904,000,000,000,000,000,000,000 (9.04 X 10^23) Bromine atoms.
Gold has a molar mass of 196.96655 grams per mole. 100 grams then is equal to .508 moles which makes 3.059 E23 atoms of gold.
3.121x10-5 Grams of Na2CO3
.0326 moles
.467 mol of Bromine gas
2,60x102 grams of bromine (Br) is equal to 1,627 moles Br2.
904,000,000,000,000,000,000,000 (9.04 X 10^23) Bromine atoms.
25,1 grams sulfur contain 4,7147765.10e23 atoms.
1,25 grams of CH4 contain 0,156696.10e23 atoms.
24,163 ng
3,45 grams of H2O contain 1,154.10e23 oxygen atoms.
It is 1 copper and 2 bromine but they are not grams they are atoms, it is a particle made up of 1 copper atom and 2 bromines
About 65 g of Zinc contain this much atoms.
6.355 x 10e10 atoms of iron contain 58,93.e-13 grams
3.121x10-5 Grams of Na2CO3
Gold has a molar mass of 196.96655 grams per mole. 100 grams then is equal to .508 moles which makes 3.059 E23 atoms of gold.
There is no 'formula' of a mole. A mole is a number of atoms or molecules or electrons (or anything, but it's usually used in chemistry) equal to 602200000000000000000000 (that is supposed to be 20 zeros after 6022). The number is usually written as 6.022 * 1023.