Mole concept

Calculate the number of iodine atoms in 4.50g of iodine gas

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?

Find the mass, in grams, of 5.00*10^23 molecules of f2