Find the mass of 8.16x10^9 molecules of n2o4 in the mg unit

Imagine that you have produced several versions of lactase, each of which differs from normal lactase by a single amino acid. describe a test that could indirectly determine which of the versions significantly alters the three-dimensional shape of the lactase protein.

Which produce would best increase the amount of heat energy that is actually gained by calorimeter b

The molality of calcium chloride (cacl2) in an aqueous solution is 2.46 m. what is mole fraction of the solute?