HARD
JEE Main
IMPORTANT
Earn 100

From 200 mg of CO2,1021 molecules are removed. How many g/mg and mole of CO2 are left? 

Important Questions on Some Basic Concepts, Mole Concept and Stoichiometry

MEDIUM
JEE Main
IMPORTANT
Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.3>Q 3

At NTP, the density of O2 is 1.429 g/L. Calculate the standard molar volume of gas.

MEDIUM
JEE Main
IMPORTANT
Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.3>Q 4

Oxygen is exploded with a gaseous alkane. For complete combustion to CO2, the volume of O2 consumed is in the ratio 7:4.  Deduce the molecular formula of alkane.

HARD
JEE Main
IMPORTANT
Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.3>Q 5
A crystalline salt on heating becomes anhydrous and loses 45.6% of its weight. Its percentage composition is Al 10.50%, K 15.1%, S 24.96% and O 49.92%. What is the formula of anhydrous and crystalline salt?
MEDIUM
JEE Main
IMPORTANT
Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.3>Q 6
 Insulin contains 3.4% sulphur. What will be the minimum molecular weight of insulin?
HARD
JEE Main
IMPORTANT
Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.3>Q 7
The volume occupied by 7.23×1023 molecules of carbon dioxide and 3.01×1023 molecules of argon at 0°C and 1 atm pressure is _______.
MEDIUM
JEE Main
IMPORTANT
Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.3>Q 8
A given sample of a pure compound contains 9.81 g of Zn, 1.8×1023 atoms of chromium, and 0.60 mol of oxygen atoms. What is the simplest formula? 
EASY
JEE Main
IMPORTANT
Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.3>Q 9
A sample of aluminium has a mass of 54.0 g. What is the mass of the same number of magnesium atoms? 
EASY
JEE Main
IMPORTANT
Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 1 - Some Basic Concepts, Mole Concept and Stoichiometry>DPP 1.3>Q 10
Four 1-1 litre flasks are separately filled with the gases H2, He, O2 and O3 at the same pressure and temperature. Find out the ratio of the total number of atoms of these gases present in different flask.