How many water molecules are present in 18g of water?

An element has a bcc structure with a cell edge of 299pm. The density of the element is 7.2g//cm^3 . How many atoms are present in 208g of the element?

How many atoms are present in a H_2S molecule

How many chambers are present in the heart of a cockroach?

How many moles of oxygen atoms are present in 1 mole of KmnO_4 ?

How many carbon atoms are present in a molecule of : RuBP

How many carbon atoms are present in a molecule of : PGA, respectively?

How many unit cells are present in a cube shaped ideal crystal of NaCl of Mass 1.0 g?