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When a magnetic sector instrument was operated with an accelerating voltage of 2500 V, a magnetic field of 0.4 Tesla was required to focus the CH4 + on the detector.
(a) What range of magnetic field strength would be required to cover the mass range between 16 and 625, for singly charged ions, if the accelerating voltage is held constant?
(b) What range of accelerating voltages would be required to cover the mass range between 16 and 625, for singly charged ions, if the field strength is held constant?
If an archaeologist finds an ancient firepit containing partially consumed firewood, and the 14C content of the wood is only 13.1% that of an equal carbon sample from a present-day tree, what is the age of the ancient site?
Calculate the dryness fraction of the steam between the separator and the throttle, and hence the dryness fraction of the steam being bled from the system.
Energy cost of dissociation was found to be 4 kWh/m3 of CO2. Calculate conversion degree of CO2 into CO and O2 in this system.
What mass of CCl4 will be formed if 1.20 moles of methane react with 1.55 moles of chlorine?
a 1.00 liter solution contains 1.00 mol of weak acid HX. After 0.60 mol of Oh- is added to this olution, the pH of the solution is 4.00. Calculate the Ka for the acid HX.
What mass of sucrose should be combined with 541 of water to make a solution with an osmotic pressure of 8.30 at 295 ? (Assume the density of the solution to be equal to the density of the solvent.)
Consider the reaction 2KClO_3(s)\rightarrow 2 KCl(s)+3O_2(g) and the following table of values: Substance Delta G (kJ/mol) KClO_3(s) -296.3 KCl(s) -409.2 O_2(g) 0 State whether it would be worthwhile to investigate finding a catalyst to use in thi..
A gaseous mixture of O2 and N2 contains 36.8 nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 545 mmHg ?
A Flask contains 0.320 mol of liquid bromine,Br_2. Determine the number of bromine molecules present in the flask.
Separate samples of an aqueous solution of an unknown ionic salt are treated with dilute aqueous solutions of hydrochloric acid, sulfuric acid, and potassium hydroxide. Precipitates are formed in all three cases.
A mixture of CS2 (g) and excess O2 (g) is placed in a 10.0 L reaction vessel at 100.0 degrees C and the pressure of 3.00 atm, A spark causes the CS2 to ignite, burning it completely, according to the equation:
An endothermic chemical reaction with ?E = +41 kJ/mol has an activation energy of +95 kJ/mol. What is the activation energy for the reverse reaction
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