Calculate mass of one atom of nitrogen in gram.

The mass of 1 atom of nitrogen is

Calculate mass of one atom of calcium in gram.

Calculate mass of one atom of calcium in gram.

Calculate the mass of one atom of oxygen.

If one mole of nitrogen molecules weighs 28 g , calculate the mass of one molecule of nitrogen in grams.

Caffeine has a molecular mass of 194 . If it contains 28.9% by mass of nitrogen, Calculate number of atoms of nitrogen in one molecule of caffeine ?