How would you determine how many grams are in a mole of any chemical element or compound?

The molar mass (or the atomic mass on the periodic table) is equal to one (1) mole of that specific element.

With compounds, just add up the molar mass of each element in the compound. Make sure you have the right number of each element as well (see the subscripts attached to the element symbol)

***Diatomic elements (when by themselves) are ALWAYS is pairs

Example:

H₂O = 2 hydrogen + 1 Oxygen

H has a molar mass of 1.008

O has a molar mass of 15.999

since we have 2 hydrogen, we multiply it's molar mass by 2

now we add the masses

1 mole of  H₂O = 18.015 g of H₂O

Explanation:

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