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# Calculating mass Watch

1. Calculate the mass of sodium that contains 4x1025 atoms
(Assume that the Avogadro constant is 6x1023mol-1)

The answer's 1533g can someone show me how to work this out?
2. (Original post by Tayla1998)
Calculate the mass of sodium that contains 4x1025 atoms
(Assume that the Avogadro constant is 6x1023mol-1)

The answer's 1533g can someone show me how to work this out?
4x1025 (atoms) divided by 6x1023 (atoms per mole) gives you the number of moles of sodium atoms there is--> 66.7 moles.

Then according to the periodic table the mass of sodium is 23 grams per mole so you multiply 23 by 66.7 to give 1533 grams. (if this was an exam question you'd use more accurate values that they give you, this here is not as accurate as i didnt use many decimal places)

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