Understanding Urea and Its Composition

The video tutorial explains how to determine the number of atoms in a urea molecule (CO(NH2)2). It begins by identifying the elements present in urea: carbon, oxygen, nitrogen, and hydrogen. The tutorial then demonstrates how to calculate the total number of atoms in a single urea molecule by considering the subscripts and parentheses in the chemical formula. Finally, it explains how to find the number of each type of atom in one mole of urea using Avogadro's number.

What is the chemical formula for urea?

• CO(NH2)2

• C2H4O2

• CH4

• NH3

Which elements are present in urea?

• Carbon, Oxygen, Nitrogen, Hydrogen

• Carbon, Oxygen, Sulfur, Hydrogen

• Carbon, Oxygen, Nitrogen, Helium

• Carbon, Nitrogen, Sulfur, Hydrogen

How many nitrogen atoms are there in a single urea molecule?

• 3

• 4

• 2

• 1

What is the total number of atoms in a urea molecule?

• 8

• 7

• 6

• 9

How do you calculate the number of carbon atoms in one mole of urea?

• Multiply by 6.02 x 10^23

• Divide by 6.02 x 10^23

• Add 6.02 x 10^23

• Subtract 6.02 x 10^23

How many oxygen atoms are there in one mole of urea?

• 2

• 4

• 1

• 3

How many nitrogen atoms are there in one mole of urea?

• 4

• 3

• 2

• 1

How many hydrogen atoms are there in one mole of urea?

• 4

• 8

• 6

• 2

What is Avogadro's number used for in this context?

• To find the volume of a gas

• To find the mass of a molecule

• To find the number of molecules in a mole

• To find the number of atoms in a molecule