A hydrated salt is a solid that contains water molecules within its crystal structure. During an experiment, a student heats a 9.10 gram sample of a hydrated salt to remove its water. The final mass of the salt is 5.41 grams. What is the percent by mass of water in this crystal?

When determining the shape of a molecule, it is important to draw a lewis dot structure first in order to see the total number a. electrons within the moleculeb. bonding and unshared pairs around central atomc. unshared pair within the molecule( i really need it )

Amixture initially contains a, b, and c in the following concentrations: [a] = 0.300 m , [b] = 1.05 m , and [c] = 0.550 m . the following reaction occurs and equilibrium is established: a+2b⇌c at equilibrium, [a] = 0.140 m and [c] = 0.710 m . calculate the value of the equilibrium constant, kc.

Why do lunar and solar eclipse not happen every month