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Aerogel or "solid smoke" is a novel material that is made of silicon dioxide, like glass, but is a thousand times less dense than glass because it is extremely porous. Material scientists at NASA's Jet Propulsion Laboratory created the lightest aerogel ever in 2002, with a density of 0.00011 pounds per cubic inch. The material was used for thermal insulation in the 2003 Mars Exploration Rover. If the maximum space for insulation in the spacecraft's hull was 2510 cm3, what mass (in grams) did the aerogel insulation add to the spacecraft?
Question- Calculate the pH at the equivalence point for the titration of 0.200 M methylamine (CH3NH2) with 0.200 M HCl. The Kb of methylamine is 5.0× 10-4. pH=
Calculate the change in molar enthalpy and molar internal energy when carbon dioxide is heated from 15 degrees Celsius to 37 degrees Celsius
if the activation energy of a unimolecular reaction is 63kj mol-1 what fraction of the reactant molecules have
Use the polygon in circle method to construct a pie molecular orbital diagram for the benzene dianion c6h6 -2 and explain why, on this basis, you would or would not expect it to be stable.
A portion of the Sun's energy comes from the reaction 4 11H → 24He + 2 10e, which requires a temperature of to. Use the mass of the helium-4 nucleus given in Table 21.7 to determine how much energy is released when the reaction is run with 1 mol of..
Explain the chemical process that occurred in his muscle cells to cause this discomfort. Explain the chemical reactions that have possibly taken place in his body after the exercise. Discuss possible treatments for the freshman and how the treatment ..
What is the molarity of a solution of 10% by mass cadmium sulfate, CdSO4 (molar mass = 208.46 g/mol) by mass. The density of the solution is 1.10 g/mL.
Propanoic acid, HC3H5O2, ionizes in water and has a Ka=1.34x10^-5. What is value of Kb for the propanoate ion
Assuming a 1.0 cm cell and a barely detectable transmittance of 99.1%, what is a reasonable lower concentration limit that one could detect of this complex ( in both mol/L and g/L)
Require to dissolve CaCl2 in water to make a mixture that is 33.0% calcium chloride by mass. If the total mass of the mixture is 942.4 g, explain what masses of CaCl2 as well as water should be used
Balanced Equation for Sulfathiazole Synthesis - Regarding the synthesis of sulfathiazole from 2-aminothiazole and p-acetamidobenzenesulfonyl chloride,
a how many moles of sodium benzoate must be added to 2.5 l of .15 m benzoic acid to form a buffer whose ph is 4.46?
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