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Sagot :
Answer
Mass of C atoms = 1.14 kg
Explanation
Given:
Mass of C2H2 = 1.24 kg = 1240 g
Required: mass of carbon atoms
Solution
Step 1: Calculate the percentage composition of carbons in C2H2
Percentage composition of carbon = [(molar mass of carbon x number of atoms of that element)/molar mass of the compound] x 100
% Composition = [(12.01 g/mol x 2)/26,04 g/mol] x 100
% composition = 92.24%
Step 2: multiply the percentage by the given mass to get the mass of carbon atoms
Mass of C atoms = % of carbon x mass of compound
Mass of C atoms = (92.24/100) x 1.24 kg
Mass of C atoms = 1.14 kg
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