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Calculate the escape velocity (the minimum initial velocity that will take an object to infinity) from the surface of a planet of radius R. What is the value for (a) the Earth, R = 6.37 × 106 m, g = 9.81 m s-2, (b) Mars, R = 3.38 × 106 m, mMars/mEarth = 0.108. At what temperatures do H2, He, and O2 molecules have mean speeds equal to their escape speeds? What proportion of the molecules have enough speed to escape when the temperature is (a) 240 K, (b) 1500 K? Calculations of this kind are very important in considering the composition of planetary atmospheres.
An unknown had the chemical formula C4H10O. It showed a positive chromic acid test, a positive lucas test in 5 minutes, and a positive iodoform test. What is the structure of the unknown compound
how many liters of oxygen gas can be produced at stp from the decomposition of 0.125 l of 3.00 m h2o2 in the reaction
the freezing point of the solution is 5.144 degrees celcius. Pure benzene freezes at 5.444 degrees celcius and has a Kf of 5.12 degrees celcius/m. What is the molar mass of thyroxine
aqueous salicylic acid with 0.020 M KOH(aq), calculate the addition of 30.0 mL of KOH(aq)? For salicylic acid, pKa=2.97
Octane (C8H18) undergoes combustion according to the following thermochemical equation: 2C8H18(l) + 25O2(g) ? 16CO2(g) + 18H2O(l) ?H°rxn = -11,020 kJ/mol. Given that ?H°f[CO2(g)] = -393.5 kJ/mol
what is the molarity of a solution prepared by dissolving 2.06g of NaOH in a volume of 500.0ml?
The temperature remains unchanged. Determine the final pressure of the system of two tanks.
the specific heat of an unknown metal is found to be 0.233 j kg. the law of dulong and petit predicts a molar heat
If solar radiation is 1200 W/m^2 , how many photons strike the leaf every second? Assume three significant figures and an average wavelength of 504 for solar radiation. A green leaf has a surface area of 2.15 cm^2.
how many atoms of aluminum can be produced by the decomposition of 31.5 g of aluminum oxide
Calculate the heat required to convert 50.0 g of C2CL3F3 from a liquid at 20.00 degrees celcius to a gas at 75.00 degrees celcius.
Determine the value of the first-order rate constant. Answer units are microseconds^-1 or (us^-1). B) Determine the half-life for the decomposition of Cl2O2.
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