Chemical Composition of Urea

What is the chemical formula of urea?

The chemical formula of urea is CO(NH2)2.

How many grams of hydrogen are present in 26.6 g of urea?

A. 4.85 g
B. 5.35 g
C. 6.45 g
D. 7.55 g

Answer:

The correct answer is B. 5.35 g.

Urea is a chemical compound that is commonly used in fertilizers, cosmetics, and pharmaceuticals. Its chemical formula is CO(NH2)2, which means it contains one carbon atom, one oxygen atom, and two amino groups.

When calculating the grams of hydrogen present in 26.6 g of urea, you need to consider the molar mass of urea. The molar mass of urea is approximately 60.06 g/mol. To find the grams of hydrogen, you can use the formula:

Grams of Hydrogen = (Number of Hydrogen Atoms / Total Number of Atoms in Urea) x Molar Mass of Urea

There are 4 hydrogen atoms in urea, so:

Grams of Hydrogen = (4 / 60.06) x 26.6 g = 5.35 g

Therefore, there are 5.35 grams of hydrogen present in 26.6 grams of urea.