Question

If you have 0.250 mol of Al, a) what is the mass of the sample, and b) how many atoms are in the sample?

Answer 1

mass of al = 27 amu

so mass of 0.250 mole of al = 0.250x27 = 6.75 amu

1 mole of al = 6.022x10²³ atom

so .250 mole = 6.022x10²³÷0.250 = 1.5055 x 10²³ atoms

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