Physical Chemistry Answers

To my understanding once hydrogen is heated up to an extreme temperature, it becomes plasma. So what would happen if hot plasma traveled through hydrogen stored inside of a fuel cell? Would it cause the cell to explode; would the stored hydrogen become plasma and therefore pass through the cell, leaving it? If not, what would happen?

Thanks.

a chemist wanted to make 100 grams of SO2. She had only 12 grams of sulfur and 4 grams of oxygen. Unfortunately, the amounts of reactants were not enough to make the desired product. How much S and O2 would she need in order to obtain the desired grams of product with no leftovers?
S + 02 = SO2 + NO LEFT OVER

Hess's Law: When phosphorus pentachloride vapor is mixed with water vapor a reaction takes place which forms POCl3 (gas) + HCl according to this reaction: PCl5(g) + H2O(g) = POCl3 (g) + 2 HCl(g) using the follwing 4 helper equations, determine the change in enthalpy for this reaction. P + 3/2Cl2(g) + 1/2O2(g) = POCl3(g) change in enthalpy = -558.5 kJ H2(g) + Cl2(g) = 2HCl(g) change in enthalpy = -184.6 kJ PCl5(g) = P + 5/2Cl2(g) change in enthalpy = +375 kJ H2O(g) = H2(g) + 1/2O2(g) change in enthalpy = +241 kJ
a. -55 kJ
b. -89 kJ
c. -109 kJ
d. -126 kJ
e. -141 kJ

Determine the amount of heat evolved in the combustion of 1 mol of methane gas to carbon dioxide and water (liquid). Assume standard conditions apply. Methane is CH4 and may be an important automobile fuel someday.

a. 675 kiloJoules
b. 730 kiloJoules
c. 774 kiloJoules
d. 845 kiloJoules
e. 890 kiloJoules

How many Joules are required to convert 65 grams of ice at -10 degrees C to steam at 120 degrees C?
a. about 357 kiloJoules
b. about 100 kiloJoules
c. about 150 kiloJoules
d. about 175 kiloJoules
e. about 200 kiloJoules

A big steam boiler is made of steel and weighs 900 kilograms empty. When filled with water, the boiler can hold 400 kilograms of water. Assuming that only 70% of the heat is delivered to the boiler steel and water (the rest goes up the chimminey) How much heat is required to raise the temperature of the entire apparatus from 20 degrees C to 100 degrees C? The specific heat of steel is 0.46 Joules/gram-degree C.
a. 238 megaJoules
b. 374 megaJoules
c. 418 megaJoules
d. 593 megaJoules
e. 619 megaJoules