(grams) x (6.02 x 10^23) / (mass number of specific element in grams)
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By saying Avogadro's number of atoms, you are saying one mole (or 6.02 × 1023 atoms). And one mole of any elements is its atomic mass. Phosphorus' atomic mass is 31.0 grams
To convert milligrams to grams:1 gram = 1000 milligramsSo take the number of milligrams and divide by 1000 to get the number of grams.To convert grams to milligrams:Take the number of grams and multiply by 1000 to get the number of milligrams.Examples:500 milligrams = 0.5 grams2 grams = 2000 milligrams
Avogadro's number (generally written as 6.02 x 10^23) is the number of atoms or molecules it takes to have one mole of a particular atom or molecule. For example, one mole of Hydrogen is just 6.022x10^23.
Divide the number of milligrams be 1000 to convert to grams: 615 mg = 0.615 g
Divide the number in kilograms by 1000.