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A fuel cell works on the same principle as a battery but is continually fed with fuel. In one fuel cell, methanol enters on one side of the unit, and air enters on the other side both circulate past electrodes, and a chemical reaction occurs that produces electricity plus carbon dioxide and water as byproducts. Which chemical reaction equation best represents the reaction that occurs in this fuel cell?
a. CH3OH+O2 -->CO2+H2O
b. CH3OH-->CO2+H2O
c. CH3OH-->CH3+OH
d. CH3OH-->CH2+H2O
e. 2CH3OH+3O2-->2CO2+4H2O
A mixture of FeO and Fe2O3 with a mass of 10.0 g is converted to 7.43 g Fe of pure Fe metal. What are the amounts in grams of FeO and Fe2O3 in the original sample
A sample of nitrogen has a volume of 630 mL at a temperature of 49 degC. Assuming that the pressure is constant, what will be the volume when the temperature is 348.6 degC.
An aqueous solution is 35 % by mass methylamine (CH3NH2) and has a density of 0.85 g/cm3. What is the pH of the resulting solution if 50 mL of this solution is diluted
How much energy would be required to melt 48 g of HCl at its melting point of -110.8C? Hfus for HCl is 14.2 cal/g and Hvap for HCl is 98.7 cal/g.
During a strenuous workout, an athlete generates 2200.0 kJ of heat energy. What mass of water would have to evaporate from the athlete's
A 12-liter tank contains helium gas pressurized to 160atm . What size tank would be needed to contain this same amount of helium at atmospheric pressure (1atm )?
The fathom was originally defined as the length of man's outsterched. it is now defined as 6.00 ft. calculate a resoanble estimate of the surface are of an adult humman' body in fathom.
The average speed of a nitrogen molecule at 20oC is 515 m/sec. How many minutes will it take the nitrogen molecule to cover exactly 20 km?
describe how will you prepare a supersaturated solution of potassium nitrate in water.
Magnesium oxide (MgO) has the rock salt crystal structure and a density of 3.58 g/cm3. Determine the unit cell edge length.
prepare 100 mL each of five standard solutions: 2.00 x 10-5, 5.00 x 10-5, 1.00 x 10-4, 2.00 x 10-4, and 5.00 x 10-4 M. These will serve as your analytical standards, which means that their phosphate concentrations must be precisely known.
If the pressure of "wet" hydrogen is assumed to equal atmospheric pressure and the volume is recorded, will the calculated moles of hydrogen gas be too high or too low?
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