MEDIUM
9th CBSE
IMPORTANT
Earn 100

Calculate the molar mass of the ozone molecule O3. Write the results with proper unit. 

Important Questions on Atoms and Molecules

MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Long Answer Type Questions>Q 35
Calculate the molar mass of the ethanoic acid CH3COOH. Write the results with proper unit. 
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 36
Which of the following pair of elements represents a mole ratio of 1:1? 
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 37
Which of the following correctly represents 360 g of water?
i 2 moles of H2O
ii 20 moles of water
iii 6.022×1023 molecules of water
iv 1.2044×1025 molecules of water
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 38
If 32 g of sulphur has x atoms, then the number of atoms in 32 g of oxygen will be: 
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 39
A student wants to have 3.011×1023 atoms each of magnesium and carbon elements. For this purpose, he will have to weigh:
HARD
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 40
The ratio of moles of atoms in 12 g of magnesium and 16 g of sulphur will be:
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 41
If 12 gram of carbon has x atoms, then the number of atoms in 12 grams of magnesium will be _____.
HARD
9th CBSE
IMPORTANT
Science for Ninth class Part 2 Chemistry>Chapter 3 - Atoms and Molecules>Multiple Choice Questions (MCQs)>Q 42
Which of the following has the maximum number of atoms?