What is the wavelength of a photon that has an energy of 2.88 x 10^19)?

What is the ph of a solution with a 1.50 × 10−9 m hydroxide ion concentration?

How much heat is released upon converting one mole of steam (18.0 g) from 100.0 ∘c to water at 25.0 ∘c? show work and constants, trying to figure out how it works. only given the heat capacity for steam and water so try to only use that

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?