What is the limiting and excess reactant if 2.2 g of Mg is reacted with 4.5 g of oxygen? How much MgO is produced? Mg + O2 MgO

also tell me how you did it please-

What is the limiting and excess reactant is 15.3 g NaCl and 60.8 g Pb(NO3)2 react? How many grams of lead (II) chloride are produced? NaCl + Pb(NO3)2 NaNO3 + PbCl2

Can anyone explain 1. review your spectrometry data and use the known elements to identify the star's composition. which unknown elements make up this star? justify your element selections. 2. in parts i and ii of the lab, what happened to the electrons of each element to produce the different colors of light? explain your answers using important terms from the lesson and information provided in the laboratory. 3. stars composed of heavier (more massive) elements are often slightly older than stars made predominantly from hydrogen and helium. based on your data, is the newly discovered star a younger star? explain your answer.