What is the number of moles, to the nearest hundredth, of molecules in a 30.5-gram sample of iron(II) oxide, FeO? Molar Mass = 71.84 g/mol

How is the composition of a meteorite relevant to finding out the composition of earth's core?

Assuming complete dissociation of the solute, how many grams of kno3 must be added to 275 ml of water to produce a solution that freezes at -14.5 c? the freezing point for pure water is 0.0 c and k_f is equal to 1.86 c/m

The kw for water at 0 °c is 0.12× 10–14 m2. calculate the ph of a neutral aqueous solution at 0 °c.