Stoichiometry Question

Stoichiometry Question NASA’s long term plans for sending astronauts to Mars involves an “ISRU” strategy. ISRU is in-situ resource utilization and means that to the extent possible, chemical resources already on Mars will be utilized. The Martian atmosphere contains about 95.3% carbon dioxide. According to one NASA plan, hydrogen will be sent to Mars from Earth before astronaut crews arrive. Fuel for the Mars Ascent Vehicle (MAV) will consist of methane-oxygen combustion: CH4 + 2O2  CO2 + 2H2O. The fuel and oxygen will be made by the following reactions: CO2 + 4H2 CH4 + 2H2O (the Sabatier reaction) And 2H2O 2H2 + O2 (the electrolysis of water) ... click for more

Chemical Conversion Problem

How do I make a 0.4mg/kg dose of Na2SeO3 (sodium selenite FW=172.9)? I need to prepare a stock solution (10mls) of sodium selenite dissolved in deionized water. Once this solution is made, I need to administer 0.4mg/kg of this compound to a 200g lab rat. The stock solution needs to be made first and then the lab rat can be treated with 0.2 ml of the sodium selenite solution....but the animal cannot receive more than 0.4mg/kg.

Calculations

Please show me how these problems are correctly solved: 15. The density of liquid water at 0 degrees C is 0.9987 g/cm cubed; the density of ice at this same temperature is 0.917 g/cm cubed. a. Calculate the volume occupied at 0 degrees C by 100. g of liquid water and by 100. g of ice. b. Calculate the percentage increase in volume when 100. g of water freezes at 0 degrees C. 19. Predict what will happen when each of these dilute solutions is tested for conductivity. Please explain to me why you made your predictions. a. CaCI2 (aq) b. C2H5OH (aq) c. H2SO4 (aq) 23 b. A coal-burning power plant generates electrical power at a rate of 500 megawatts; that is, 500 X 10 to the 6th... click for more

Density of ice/water, conductivity, and fuel calculations

15. The density of liquid water at 0 degrees C is 0.9987 g/cm cubed; the density of ice at this same temperature is 0.917 g/cm cubed. a. Calculate the volume occupied at 0 degrees C by 100. g of liquid water and by 100. g of ice. b. Calculate the percentage increase in volume when 100. g of water freezes at 0 degrees C. 19. Predict what will happen when each of these dilute solutions is tested for conductivity. Please explain to me why you made your predictions. a. CaCI2 (aq) b. C2H5OH (aq) c. H2SO4 (aq) 23 b. A coal-burning power plant generates electrical power at a rate of 500 megawatts; that is, 500 X 10 to the 6th power pr 5.00 X 10 to the 8th power joules per second. The... click for more

Chemistry - Gases

Chemistry - Gases Using "dimensional analysis" show that 1 L kPa = 1 J. Hints : P= F/A; 1 Pa = 1 N/m^2; energy = F x d