I dont know how to do percent error.

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?

How does concentration affect reaction rate

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?