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What pressure will be exerted by 0.675 moles of a gas at 25*c if it is in a 0.750-l container?

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

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