Question

ii) Calculate the number of moles and molecules present in 11.2 g of Urea.
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Answer 1

Given weight = 5.6g

∴ Moles of urea =

60

5.6

=0.0933 moles

No. of H atoms =4×0.0933×Na=2.25×10

23

atoms

No. of N atoms =2×0.0933×Na=1.123×10

23

atoms

No. of C atoms =No.ofOatoms=0.0933×Na=5.6×10

22

atoms