if we approximate the atmosphere to be 79% nitrogen (n2) and 21% oxygen (o2) by volume, calculate the density of air (kg/m3) at stp conditions (0oc, 1 atm). hint: 1 mole of gas occupies 22.414 l at stp.

*will mark you brainliest + 15 points ** why does the equilibrium of a system shift when the pressure is increased? a. to maximize the stress on the system b. to stop restoring equilibrium to the system c. to increase the total moles of gas in the system d. to decrease the total moles of gas in the system

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory