(b) number
of moles in 19 g of
(c) formula unit
mass of
[Atomic mass
unit Al = 27u,C = 12u,
]
Answer:
(a) Molar
mass of 
= 18 g (1 mol) As, 18 g contains 6.022 x 1023
molecules
will
contain
(b) Molar
mass of 
As, 34 g
of 
mole of 
of
(c) 
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