Homework Answers
Hi Dear Friend, the Answers are in bold.
a) (1.792 x 10-22g ) / (1.661 x 10-24 g) = 107.8868 a.m.u
b) 1 mole of any element contains 6.023 x 1023 atoms according to Avagadro's number.
c) a.m.u is also called as gram / mole, therefore molar mass of unknown element = 107.8868 g/mol
d) moles in 10.00 grams of unknown element = mass of unknown element / molar mass of unknown element
moles = 10.00 g / 107.8868 g/mol = ~ 0.1 mole.
e) 1 mole of any element contains 6.023 x 1023 atoms/molecules
0.5 mole have molecules = 0.5 x 6.023 x 1023 molecules = 3.0115 x 1023 molecules.
f) The atomic mass closely resembles to silver Ag. Identity of unknown element is Ag.
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