Calculate the percent nitrogen in these common fertilizers. a. NH₂ b. NH₄NO₃ Please show all calculations

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

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Suppose the universe were completely empty except for one object-a solid sphere moving through space of 100 km/s. what sort of path would the object be moving in? explain your answer