EASY
JEE Main
IMPORTANT
Earn 100

Find the ratio of the number of molecules contained in 1 g of NH3 and 1g of N2.

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Important Questions on Elementary Problems Based on Definition of Mole: The Mole Concept

HARD
JEE Main
IMPORTANT
How many molecules of CO2 are contained in one liter of air if the volume content of CO2 is 0.03 % at NTP is p×1018. Find out the value of p? 
EASY
JEE Main
IMPORTANT
Is the number of molecules in 1 kg of H2 and 1 kg of O2 the same? What is the ratio of weights of H2 and O2, the mixture of which contains equal number of molecules of each gas? 
EASY
JEE Main
IMPORTANT
The measured density at NTP of a gaseous sample of a compound was found to be 1.78 g/L. What is the weight of 1 mole of the gaseous sample? 
EASY
JEE Main
IMPORTANT

If the concentration of a solution is 2 M. Calculate the number of milli-moles present in 2 litres of the solution.

EASY
JEE Main
IMPORTANT

The number of moles of oxygen are contained in one litre of air is x×10-3, if its volume content is 21% at NTP. Find the value of x.

Round off your answer to the nearest integer.

MEDIUM
JEE Main
IMPORTANT
How many atoms do mercury vapor molecules consist of if the density of mercury vapor relative to air is 6.92 ? (Hg=200). The average mass of air is 29 g/mole.
MEDIUM
JEE Main
IMPORTANT

Calculate the total number of atoms in 0.5 mole of K2Cr2O7.

Divide the final answer by 1024.

Round off your answer to the nearest integer.

EASY
JEE Main
IMPORTANT
What is the volume of 6 g of hydrogen at 1 atm and 0°C in L?