Atoms and Molec...

Calculate the number of atoms of sulphur present in $$0.5$$ moles of $${ Na }_{ 2 }{ S }_{ 2 }{ O }_{ 3 }$$:

What weight of calcium contains the same number of atoms as those in $$3 g$$ of carbon?

What is the approximate molecular mass of dry air containing 78% $$N_2$$ and 22% $$O_2$$?

Identify the pair of substances having the same formula unit mass.

The heaviest among the following is:

What is the mass of one molecule of oxygen?

Calculate the number of atoms present in $$71 g$$ of $${ Cl }_{ 2 }$$.

Who was the first scientist to propose that all matter was made of small spheres called atoms?

A smallest particle of a compound that can have the independence existence and that can retain all the properties of that compound is called as:

Which of the following term is denoted as Formula Mass Unit?