The yield of the overall reaction is 70.0 % is 43.218 kg.
An equation for a chemical reaction is considered to be balanced if both the reactants and the products have the same number of atoms and total charge.
The balanced equation for the reaction is:
6 HNCO(l) → C₃N₃(NH₂)₃(l) + 3 CO₂(g)
Convert urea quantity from kilograms to moles.
Molar Mass of urea = 60.06 g/mol so, 177.5kg urea contains
177.5kg / 60.06 = 2.95mol urea
Divide the moles of urea by 6, since the balanced equation shows that 6 moles of urea will only produce 1 melamine.
2.95 / 6 = 0.49kmol melamine
Now multiply 0.49 with molar mass of melamine that is 126 g/mol
126 x 0.49 = 61.74kg
Yield of overall reaction is 70% so multiply 61.74 with 0.70
61.74 x 0.70 = 43.218 kg.
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