Calcula el %m/m de una disolución que tiene 27 gr de soluto y 268 de solvente

Iam in desperate need of with this !

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

Calculate the molarity of each of the following solutions. part a) 0.12 mol of lino3 in 5.5 l of solution part b) 60.7 g c2h6o in 2.48 l of solution part c) 14.2 mg ki in 100 ml of solution