Name: Different Units of Temperature
Uploaded: 2019-07-19
Duration: 5 min 52 s
Description: The concept introduces the various units that are used for measuring temperature. The properties of each unit along with their interconversions are also disc...

Question

Calculate the number of atoms of hydrogen present in $5.6 g$ of urea, $({NH}_{2})_{2} CO$ . Also calculate the number of atoms of $N, C$ and $O$ .

Accepted Answer

The molar weight of Urea $({NH}_{2} {CONH}_{2})$ $= 60 g {mol}^{- 1}$

Thus, the number of moles of urea in $5.6 g$ is $= \frac{5.6 g}{60 g {mol}^{- 1}} = 0.093 mol$

Now, $1$ molecule of urea contains $4$ hydrogen atoms

Similarly,

$1$ mole of urea contains $4$ mole hydrogen atoms

Therefore, $0.093$ moles of urea will contain $= 4 \times 0.093$ $= 0.372$ moles of hydrogen atoms.
i.e. $0.372 \times 6.022 \times 10^{23} = 2.24 \times 10^{23}$ hydrogen atoms.

Similarly,

$1$ molecule of urea contains $2$ nitrogen atom

Thus, $0.093$ moles of urea will contain $({NH}_{2})_{2} CO$ moles $= 0.186$ moles of nitrogen

i.e. $0.186$ $\times 6.022 \times 10^{23}$ atoms $= 1.120 \times 10^{23}$ nitrogen atoms

Similarly,

$1$ molecule of urea contains $1$ carbon and $1$ oxygen atom

Therefore, $1$ mole of urea contains $1$ mole carbon and $1$ mole oxygen atoms,

Thus, $0.093$ moles of urea contain $= 1 \times 0.093$ mole of carbon atoms $= 0.093$ mole of carbon atoms

and $0.093$ moles of urea contain $= 1 \times 0.093$ mole Oxygen atom $= 0.093$ mole Oxygen atom

$1$ mole contains $6.022 \times 10^{23}$ atoms

Hence, the number of carbon and oxygen atoms will be $= 0.093$ $\times 6.022 \times 10^{23}$ atoms $= 0.56 \times 10^{23}$ atoms.

Calculate the number of atoms of hydrogen present in $5.6 g$ of urea, $({NH}_{2})_{2} CO$ . Also calculate the number of atoms of $N, C$ and $O$ .

Important Questions on Some Basic Concepts of Chemistry

Learn and Prepare for any exam you want !

Calculate the number of atoms of hydrogen present in 5.6 g of urea, (NH2)2CO. Also calculate the number of atoms of N, C and O.

Important Questions on Some Basic Concepts of Chemistry

Learn and Prepare for any exam you want !

Calculate the number of atoms of hydrogen present in $5.6 g$ of urea, $({NH}_{2})_{2} CO$ . Also calculate the number of atoms of $N, C$ and $O$ .