What is the frequency of a photon with an energy of 3.03x10^-19J?

What’s the percent by mass of carbon in c10h14n2

What is the overall order of reaction for rate = k[no]2[o2]

Which ocean zone has the most abundant primary producer and why a) the abyssopelagic zone ,du to the absence of light and cold water temperatureb) the bathypelagic zone, due to the absence of light and cold water temperaturec) the mesopelagic zone ,due to uts high light availability and warm water temperature d) the epipelagic zone,due to its high light availability and warm water temperature