- Why does meiosis and mitosis happen? Please... this is my new lesson..?

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How many moles of ions are in a solution of 7.4 moles FeCI3 in 500 mL water? What is the partial pressure of N2 in a mixture of N2 and O2 having a total pressure of 1075 torr if the partial pressure of O2 is 720 torr? I need to describe two ways I would measure moles in chemistry lab and identify any equipment I would use? Help me to solve the following question!
Find integers x and y such that 57x+79y=17, and 400 Naphthalene sublimation rate=3*10^-5/min. Volume of room=60m^3. How would I calculate the naphthalene concentration in the air of the room?