Question

Calculate the number of mass
and molecules of urea present in
5-6 gm of urea [NH₂-CO-NH₂]





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Answer 1

Answer:

The molar mass of urea is 60g/mol. That means that every mole of urea has a mass of 60 grams and that in every gram of urea there are 0.01667 moles . Based on that, we can calculate the moles in 5.6 grams of urea.

5.6 grams * 0.01667 moles per gram = 0.09333 moles

We know that in every mole there are 6.022140857 × 10^23 units of the substance, in this case molecules.

6.022140857 × 10^23 molecules per mole * 0.09333 moles = 5.6207 x 10^22 molecules

The molecular formula of urea is CO(NH2)2 so there are 4 hydrogen atoms in every molecule of urea.

Answer 2

Answer:

Molecular formula of urea CON2H2

Molar mass of urea = 60gmol−1

Number of moles of urea = n=MW

                                        =605.6=0.09333mol

Now,

∴ 1 mol urea contains 4 gram atoms of hydrogen(H)

∴ 0.09333mol urea contains==4×0.09333=0.3733 gram atom of H.

Now, 

  1gm atom of H contains =6.022×1023atoms of H.

0.3733gram atom of hydrogen contains = 6.022×1023×0.3733=2.248×1023

Conclusion: Number of H atoms = 2.248×1023