The chemical reaction that causes iron to corrode in air is given by
4Fe + 3O2→2Fe2O3 in which at 298 K
ΔHrxn= 1684 kJ
ΔSrxn= 543.7 J/K

Part A. What is the standard Gibbs free energy for this reaction? Assume the commonly used standard reference temperature of 298 K.

Part B. What is the Gibbs free energy for this reaction at 3652 K? Assume that Delta H and Delta S do not change with temperature.

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies. molten iron has a density of 7.0g/cm cubed. in its solid state, iron has a density of 8.0g/cm cubed.

Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground.

The passage that directs air to the lungs is called a. diaphragm. b. larynx. c. bronchi. d. pharynx.