Question

Calculate the number of moles and molecules of urea present in 30 gram of urea

Answer 1

Explanation:

molar mass of urea =60 g/mole

Therefore no of moles in 30g of urea = 30/ 60 mole=0.5mole

Answer 2

Given:

Mass of Urea: 30grams

To find:

Number of moles.

Solution:

Molar mass of Urea is 60grams/mole

Molar mass of a compound is the mass of the compound divided by the amount ofthe compound measured in moles.

So, $molar mass=\frac{mass}{number of moles}$

We know that to find the number of moles, we can use the formula

$number of moles=\frac{given mass}{molar mass}$

So, the number of moles= $\frac{30}{60}$

=0.5moles.

Now,

$1 mole=6.023$×$10^{23}$molecules

So, $0.5 moles=6.023$×$0.5$×$10^{23}$molecules

=$3.0115$×$10^{23}$molecules.

Hence, the number of moles and molecules of urea present in 30 gram of urea is 0.5moles and $3.0115$×$10^{23}$molecules.