HARD
9th CBSE
IMPORTANT
Earn 100

Compute the number of O atoms in 54g of water. M(H2O) = 18 g/mol.

Important Questions on Atoms and Molecules

EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Numerical On Mole And Its Role>Q 5
A vessel contains 5.6 g of nitrogen (N2) gas. Calculate the following quantities if the molar mass of N atoms is 14 g/mol.
Moles of (N2).
MEDIUM
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Numerical On Mole And Its Role>Q 5
A vessel contains 5.6 g of nitrogen (N2) gas. Calculate the following quantities if the molar mass of N atoms is 14 g/mol.
The number of N2 molecules.
MEDIUM
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Numerical On Mole And Its Role>Q 5

A vessel contains 5.6 g of nitrogen N2 gas. Calculate the following quantities if the molar mass of N atoms is 14 g/mol:

Number of N atoms.

HARD
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Numerical On Mole And Its Role>Q 6
You are asked to buy your chemistry teacher to buy 5 moles of distilled water from the medical store where small bottles each containing 10mL(=10g) distilled water are available. How many such bottles would you buy?
HARD
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Numerical On Mole And Its Role>Q 7
How many Ag atoms are there in 0.0001g of silver? Molar mass of Ag is 108g/mol.
HARD
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Numerical On Mole And Its Role>Q 8
How many moles of hydrogen atoms are there in one mole of water H2O? What is the total number of H atoms in one mole H2O.
HARD
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Numerical On Mole And Its Role>Q 9
What is the number of H2O molecules in 1 drop of water which weighs 0.06g?
HARD
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Numerical On Mole And Its Role>Q 10
The molar mass of O atoms is 16g/mol. What is the mass of oxygen atom?