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A mole of an element or compound is 6.022 x 1023 (Avogadro's constant) molecules of that substance. This number is the number of molecules it takes for an amount of substance to have a mass in grams the same as its molecular mass: carbon has a molecular mass of 12, so 6.022 x 1023 (one mole) carbon atoms have a mass of 12 grams.

The molecular mass of sodium is 23 (22.989) so one mole of sodium has a mass of 23 grams. Sodium chloride has a molecular mass of 58.44 so a mole of NaCl is 58.44 grams.

One mole of sodium will make one mole of sodium chloride.

Na + Cl => NaCl

So four moles of sodium will make four moles of sodium chloride.

4Na + 4Cl => 4NaCl

Four moles of NaCl has a mass of 4 x 58.44 = 233.76 grams.

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11y ago

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