5. In a chemical reaction 646gram ammonia is reacting with 1.144kilogram carbon
dioxide to give urea? Find the limiting reagent and excess reagent in the reaction?
Calculate the quantity of urea formed? Calculate the the amount of carbon dioxide
which is left unreacted?
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Answer:
2NH
3
+CO
2
→NH
2
CONH
2
+H
2
O
Moles of urea=
60
999.6×10
3
=16.66×10
3
.
∴ Moles of CO
2
=16.66×10
3
.
C
n
H
2n+2
+O
2
→nCO
2
+H
2
O
n
16.66×10
3
×[12n+(2n+2)]=236×10
3
n≅12
∴ Molecular formula of the hydrocarbon=C
12
H
26
.
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