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To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. A chemical engineer places a mixture of noble gases consisting of 6.18 g of He, 14.9 g of Ne, and 34.9 g of Kr in a piston-cylinder assembly at STP. Calculate the partial pressure of each gas.
How many grams of phosphorus react with 35.8 L of O2 at STP to form tetraphosphorus decaoxide?P4(s) + 5 O2(g) --------P4O10(s)
Why did the grape juice change color when an acid or base was added. 5. You added a base, sodium bicarbonate, to test tube 1 that contained citric acid and an acid to test tube 2 that contained base.
Consider the titration of 50.0 mL of 0.450 M C5H11N(aq), piperidine solution (Kb = 1.3 x 10-3), with 0.350 M HNO3(aq). What is the pH of the solution when 15.0 mL of 0.350 M HNO3(aq) is added? Calculate the pH of the solution at the halfway point of ..
ultraviolet light strikes a metal plate and ejects electrons having kinetic energy E = 2.04 eV. Calculate the binding energy of an electron at the metal surface.
The reactions occur in acidic solution. (Use the lowest possible coefficients. Omit states-of-matter in your answer.) (a) MnO4- + H2SO3 ? Mn2+ + SO42-
Consider the reaction that occurs when a solution containing hydrochloric acid (HCl) is added to a solution containing the weak base methylamine (CH3NH2).
Determine the rate law for the reaction and calculate the rate constant.
When would you do a hot filtration. Why do you wash your crystals after you collect them by filtration
sodium azide, a compound containing only sodium (Na) and Nitrogen (N), is used as a propellant for inflating airbags in some automobiles. A sample of sodium azide was weighed into a crucible.
Assuming that radiation with lambda = 15.0 {rm cm} is used, that all the energy is converted to heat, and that 4.184 {rm J} is needed to raise the temperature of 1.00 {rm g} of water by 1.00 ^circ {rm C}.
Is the radial node of the hydrogen 2s wavefunction inside or outside (relative to the nucleus) of the most probable radius of the 1s state?
Assuming the solution has a heat capacity of 4.18 J/°C·g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.
How many moles of atoms are in each of the following? 4.1*10^24 Pb atoms ,2.15*10^22 He atoms
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