How many moles are contained in 7.88 x 10^24 atoms of Iron

All cells are made of four types of acids, lipids, proteins, and carbohydrates.

Label a-f based on the table using c for concentrated and d for dilute

Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o          sncl2•4h2o          sncl2•6h2o