A sample of aluminum foil contains 7.80×1023 atoms. What is the mass of the foil?
Molar mass of Al = 27 g/mol
Moles of Al = =7.80×10^23/6.022×10^23
= 1.30 mol
Mass = mole × molar mass
= 1.30 × 27
= [35.0] g
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