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Given:
Weight of Li2CO3 = 154 g
To find:
number of moles of Lithium Carbonate Li2CO3 = ?
Solution:
first we have to calculate the molar mass of Lithium Carbonate,
The elemental composition of Li2CO3
Li = 2 units, Atomic weight of each Li atom is 7 g/mol
Li = 2 × 7 = 14 g/mol
C = 1 unit, Atomic weight of Carbon is 12 g/mol
O = 3 units, Atomic weight of each O atom is 16 g/mol
O = 3 × 16 = 48 g/mol
Atomic weight of Li2CO3 = 14+12+48 = 72 g/mol
now,
[tex]number \: of \: moles = \: \frac{Given \: weight \: of \: substance}{Atomic \: weight \: of \: substance} [/tex]
Number of moles = 154/72 = 2.14 moles
Answer- The number of moles of Lithium Carbonate is 2.14
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