FINAL EXAMINATION CHM101 Fa I) Hypergolic propellants are fuels and oxidizers vw
ID: 104361 • Letter: F
Question
FINAL EXAMINATION CHM101 Fa I) Hypergolic propellants are fuels and oxidizers vwlhich ignite gnition source, hypergolics are ideal for spacecraft maneuvering systems as they provide an casy sa capability. Also, hypergolics do uiot pose the storage problems of cryogenic propellants (e g. liquid oxygen and hydrogen) as they remain liquid at rormal temperatures This technology was used on the Apollo 11 Mission 40- years ago As part of the testing for a new thruster design, amounts of unsymmetrical dimethyl hydrazine, or UDMH (CHs N-NHz: MW-60.1] were reacted dinitrogen tetroxide IN204: MW 921. The balanced equation for this reaction is shown below For one test, 1,500.0 grams of UDMH was commpletely consumed. How much dinitrogen tetroxide lin grams was needed? [S points] Relative to Problem 1, 721.2 grams of UDMH are consumed in another test and all of the product gases created [Na, water vapor and CO:] are collected into a 100.0-Liter container a1 27 2) a) How many total moles of gaseous products were createi? [4 points) b) Using the Ideal Gas Equation, calculate the total pressure of the gases in the 100.0-L container at 27 'C. [5 points c) Using Dalton's Law, determine the parial pressure of the nitroge gas formed. [3 points)Explanation / Answer
1.
molar mass of UDMH = 60.1 gm/mole then 1500 gm of UDMH = 1500 / 60.1 = 24.9584 mole
Accoring to reaction 1 mole of UDMH react with 2 mole of N2O4 then to react with 24.9584 mole of UDMH required N2O4 = 24.9584 X 2 = 49.9168 mole
49.9168 mole of N2O4 required
molar mass of N2O4 = 92.1 gm/mole then 49.9168 mole of N2O4 = 49.9168 X 92.1 = 4597.34 gm
4597.34 gm N2O4 required
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