A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly
12 grams of carbon-12 (i.e., 6.023 X 1023).
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If you know the particles, moles, or grams of a substance, you can calculate the other two measurements by using the following equation:
1 mole = 6.022 × 1023 particles/mol = formula weight expressed in grams.
From , the mass of one atom of chromium is 51.9961 amu.
The mass of one mole (6.02 X 1023) of chromium atoms is 51.9961 grams.
2Mg(s) + O2 (g) → 2MgO(s)
The balanced equation above shows that the product is 2 molecules of magnesium oxide. That also means 2 moles of magnesium oxide.
By calculating the molar mass of MgO, then multiplying by the coefficient 2, the mass of MgO produced can be predicted
from the balanced equation.
A way to look at the meaning of mole.
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