3)
Molar mass of Al = 26.98 g/mol
use:
mass of Al,
m = number of mol * molar mass
= 2.5 mol * 26.98 g/mol
= 67.45 g
Answer: 67.4 g
4)
Molar mass of Li = 6.968 g/mol
number of mol = 3.48*10^-2 umol
= 3.48*10^-8 mol
use:
mass of Li,
m = number of mol * molar mass
= 3.48*10^-8 mol * 6.968 g/mol
= 2.425*10^-7 g
Answer: 2.42*10^-7 g
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