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Write down the electron configurations for the following ions, and calculate which have noble-gas configurations: (a)Mn3+ (b) Se2- (c) Sc3+ (d) Ru2+ (e) Tl+ (f) Au+
An ideal gas of volume=0.1m^3 and at 400K and 1bar pressure is allowed to expand to the 0.11m^3 at constant temperature. How can calculate the increase in entropy of the gas?
A 4-level system at 1000K which is having the N particles with energy levels (ε1 - ε0) = 0.15eV, (ε2-ε0) = 0.45eV, and (ε3-ε0) = 0.75eV. Each leve
Is it possible to determine the percentage abundance of each isotope? Why or why not? Assume that an unknown element "X" exists naturally as three different isotopes. The average atomic mass of elem
Determine the order of the reaction if at 518oC, the rate of decomposition of a sample of gaseous acetaldehyde, initially at a pressure of 363 Torr, was 1.07Torr s-1when 5% had reacted and 0.76 Torr s
The carbonium ion mechanism for SN1 reactions suggests an optically active starting material would give totally racemized product. In many cases, however, SN1 reactions actually give more of the produ
The stack gas leaves the furnace at 900 degrees C and is cooled to 450 degrees C in a waste heat boiler, a heat exchanger in which heat lost by cooling gases is used to produce steam from liquid wat
Determine the product when 2,5dibromohexane reacts with the two AlCl3: hint Make a6-membered ring cyclic. In other words, bring the alkyl chain around to make a fused ring onto benzene.
A line in the spectrum of neon has a wavelength of 837.8nm. Explain in what spectral range does the absorption occur?Determine the frequency of this absorption.
Determine how to use the stoichiometry between the KHP and NaOH from the balanced equation below to find the moles of NaOH?? Potassium hydrogen phthalate NaOH and (KHP)
A weighed sample of iron (Fe) is added to liquid Bromine (Br2) and allowed to react totally. The reaction forms a single product, explain which can be isolated and weighed.
A 0.985 gram sample of gas occupies a volume of 145.0ml at the 100 degrees C and 750 mm Hg. Determine the new volume in STP.
Describe the percent yield of a reaction that forms 28.65g of Fe when the 50.0g of Fe2O3 react with excess Al according to the following reaction.
How can find out the velocity of an electron emitted by a metal whose threshold frequency is 2.41×1014 when it is exposed to visible light of wavelength5.01×10-7 m
Which one of the following cations would form a precipitate when added to an aqueous solution of this compound? A compound was found to be soluble in water.
What is the pressure in mmHg if the pressure of an unknown gas is calculated with a manometer. Instead of mercury the manometer is filled with a liquid (X) whose density is 0.737 g/cc. The pressure
Explain how much ice must be added to the cauldron in order to cool the water to 20oC? A cauldron contains 12 gallons of water at 90oC. The enthalpy of ice relative to liquid water at 0oC is -348 kJ/k
The container's volume is increased to 4.0L at constant temperature and the liquid/vapor equilibrium is reestablished. A sample of CH4 in equilibrium with its vapor in a closed 2.0L container
Determine the energy difference for an electron transitioning from the 2nd energy level to the 4th energy level? What is this transition called?
Determine what is being oxidized and what is being reduced in the following reaction, and tell how many electrons are being transferred:
Determine the ph of the solution that results when 20 ml of .2MHCO2H (it's a monoprotic acid) Ka= 1.80*10^-4 is mixed with the 25 ml of .16 NaOH.
Determine the final pressure inside the bottle if a piece of dry ice (solid CO2, density = 0.900 g/cm3) weighing 12.00 g is placed into an 500 mL bottle open to the air with room pressure equal to 0.9
Equal volumes of three different weak acids, labeled as A, B, and C, are each titrated with the 0.1 M NaOH. Acid a needed 20 mL of NaOH and the pH at the stoichiometric point was 8. Acid B required
What error would result in the volume measurement, and what would be the effect of this error on the calculated density when the air bubbles were trapped in your solid beneath the liquid level in y
Hydrogen peroxide can decompose to oxygen and water by the following reaction: Determine the value of q(heat) when the 5.00 g of H2O2(l) decomposes at constant pressure.