True or false? Cadmium is not in the mixture because the mixture does not contain a spectral line at 515nm

How do scientists think that gravity affected the formation of our solar system?

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o          sncl2•4h2o          sncl2•6h2o