The amount of lithium are formed from the reaction if you begin with 89.5 grams of copper is 19.6 grams.
How do we convert mass into moles?
Mass can be converted into moles by using the below equation as:
n = W/M, where
W = given mass
M = molar mass
Moles of 89.5g of copper = 89.5g / 63.5g/mol = 1.4 mol
Given chemical reaction is:
Cu + Li₂S → 2Li + CuS
From the stoichiometry of the reaction, it is clear that
1.4 mole of Cu = produces 1.4 mole of CuS
1.4 mole of CuS = produced by 1.4 mole of Li₂S
1.4 mole of Li₂S = produces 2×1.4=2.8 moles of Li
Mass of 2.8 moles of Li = (2.8mol)(7g/mol) = 19.6g
Hence resultant mass of lithium is 19.6g.
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