What is the molarity of 4 L of a solution that contains 2.5g of sodium chloride

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?

Use the half-reactions of the reaction au(oh)3 + hi -> au +i2 +h2o to answer the questions

27 drag each label to the correct location on the image. a particular exosolar system has five planets in total: a, b, c, d, and e. the table lists the orbital periods of these planets in days. planet orbital period (days) a 600 b 80 c 1,000 d 500 e 100 move each planet to its orbit in the system.