One mole of an element contains `6.022xx10^23` atoms.
find the number of oxygen atoms in 4 g of `O_2`.

One gram atom of an element contains 6.023xx10^23 atoms. Find the number of atoms in 8 g oxygen.

One mole of an element contains 6.022xx10^23 atoms. Which is heavier, one oxygen atom or 10 hydrogen atoms?

What will be the number of oxygen atoms in 1 mole of O_(2) ?

One gram atom of an element contains 6.023xx10^23 atoms.Define mole and Avogadro number.

One gram atom of an element contains 6.023xx10^23 atoms. Which is heavier , 1 ovygen atom or 10 hydrogen atoms?

One gram mole of a substance contains 6.022xx10^23 molecules. Find out the number of molecules in 2.8 g of nitrogen.

One atom of an element X weighs 6.644 xx 10^(-23) g. Calculate the number of gram-atoms in 40 kg of it.

Mass of one atom of X is 6.66xx10^(-23)g . Hence number of mole of atom X in 40kg is

One gram mole of a substance contains 6.022xx10^23 molecules. 24 g of carbon is treated with 72 g of oxygen to form CO_2 . Find the number of molecules of CO_2 formed in this situation.

Choose the incorrect statement from the following. a) 1 mole Hydrogen atom contains 6.022xx10^23 atoms. b) 1 mole oxygen gas contains 2xx6.022xx10^23 atoms. c) Mass of 1 mole of chlorine is 35.5 g. d) Mass of 0.5 mole of water is 18g. e) 1 mole of nitrogen gas contains 22.4L volume at any state. (Hint: Atomic mass H-1, 0-16, 1-35.5,N=14)