Class XI Chemistry Mole concept and Stoichiometry 10

The number of gram molecules of oxygen in 6.02*10²⁴ CO molecules is

Which one of them has least mass?

A compound contains two oxygen atoms, four carbon atoms and number of hydrogen atoms is double of carbon atoms. What is the density of vapour of this compound ?

How many significant figures should be present in 3*3.897 ?

Pressure of a gas in a vessel can be measured by

Given the numbers: 161 cm, 0.161cm,0.0161cm. the number of significant figures for the three numbers are:

It is known that atoms contain protons, neutrons and electrons. If the mass of neutron is assumed to be half of its original value whereas that of electron is assumed to be twice of this original value. The atomic mass of ₆C¹² will be-

A sample of impure cuprite, Cu₂O, contains 66.6% copper. What is the percentage of pure Cu₂O in the sample -