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- The time flight of an unknown compound was 23.021 μs at 1087V and flight tube lenght of 1.0m. What was the molecular weight?The chemical reaction from two chemicals resulted in a waste product which is composed of an oxygen atom bonded by two hydrogen atoms. Afterwards, he checks the quality of the substance at 131 F. The actual recorded mass for three experiments of the 0.5 cubic meter substance were 0.0525 , 0.0656 and 0.0577 ,respectively. What is the quality of the substance for each trial?25. 600 mL of a gas at 345 kPa will occupy a volume of (A) 1200 mL (B) 300 mL (C) 690 mL (D) 255 mL mL if the pressure is doubled. 26. J.J. Thomson's experiments with discharge tubes demonstrated that: (A) alpha particles are the nuclei of helium atoms (B) the mass of an atom is concentrated in the hucleus (C) cathode rays are streams of negatively charged particles (D) positive particles are attracted to the cathode
- (4) (а) Given the following equation, solve for p 2mg V =For the reaction C614N714+?, if 100.0 g of carbon reacts, what volume of nitrogen gas (N2) is produced at 273K and 1 atm?The total volume of hydrogen gas needed to fill the Hinderburg was 2.00 x 108L at 1.00 atm and 25.0oC. How much energy was evolved when it burned?*hint - Use the Ideal Gas Law to obtain the moles of hydrogen gas. 2 H2(g) + O2(g) --> 2 H2O(l) ΔH = -572 kJ
- SpaceX recently launched their Falcon Heavy rocket (Feb. 6, 2018). It is based on their existing Falcon 9 rocket. The Falcon 9 rocket has a first stage which is a 40 m high by 3.7 m diameter cylinder. This cylinder contains the fuel used to propel the rocket which consists of RP-1 (rocket propellant-1, high grade kerosene), and liquid oxygen, O2 (`). RP-1 is a complex mixture of hydrocarbons but let’s approximate it with a chemical composition of C12H26. The densities of the fuel are ρ (RP − 1) = 0.83 g cm3 ρ (liquid O2) = 1.141 g cm3 If the total volume available for the two tanks is contained in the 40 m high by 3.7 m diameter first stage, determine the volume of each individual tank that will provide the exact amount of RP-1 and oxygen for the reation (no limiting reagent) and take up the entire volume of the first stage. Here are some suggestions to guide you. 1. Write a balanced combustion reaction for C12H26 with O2. 2. Determine the ratio of the volumes of the individual RP-1…Calculate the enrichment factors from effusion for a mixture of 235UF6 and 238UF6, uranium hexafluoride with two different uranium isotopes. The atomic mass of 235U is 235.04, and that of 238U is 238.05. The atomic mass of fluorine is 19.00.given these virial equations: Z = 1 + 2B’ p + 3 C’ p2 + D’ p3 + E’ p4 + ….. Z = 1 + 4B (1/Vm) + 5C (1/Vm)2 + D (1/Vm)3 + E (1/Vm)4+ …. where B’, B, C’, C, D’, D, E’ and E, etc, are virial coefficients; p is the pressure and Vm is the molar volume. how can i find the relation between B and B' and how do I determine the ratio of B'/B at T = 420 K from your expression?
- The concentration of H2O in the stratosphere is about 5ppm. It undergoes photodissociation according to:H2O(g)----->H(g) + OH(g)(a) Write out the Lewis-dot structures for both products andreactant.(b) Using Table , calculate the wavelength required tocause this dissociation.(c) The hydroxyl radical, OH, can react with ozone, givingthe following reactions:OH (g) + O3(g)---->HO2(g) + O2(g)HO2(g) + O(g)----->OH(g)+ O2(g)What overall reaction results from these two elementary reactions?What is the catalyst in the overall reaction? Explain.4. Force-versus-Time Curve. The magnitude of the net force exerted in the x direction on a 2.50-kg particle varies with time as shown in the force-time curve. Find: (a) the impulse of the force over the 5.00-s time interval; (b) the final velocity the particle attains if its originally at rest; (c) its final velocity if its original velocity is -2.00i m/s; and (d) the average force exerted on the particle for the time interval between 0 and 5.00 s. F, (N) 4 2 1 t(s} 1 2 stGiven g(x, y, z)= e sin(-2x) cos(y), millimis memen VEM Ple Cre COMET The wor M Pa ex ma
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