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Ionization energy is the energy needed to eject an electron from an atom. Compute the ionization energy of a hydrogen atom in its first excited stat (n=2)
25 mL of 0.10 M HCl is mixed with 25 mL of .43 M NH3. What is the resulting pH?
How many stereoisomers are possible for each of the following substances? Draw them, and name each by the R-S and E-Z conventions.
Consider the two containers below, labeled C and D, one with an ideal gas atom and one with ideal gas molecules, each at the same temperature. The gas molecule has more mass than the gas atom. one container has one molecule
A 9.70-g piece of solid CO2 (dry ice) is allowed to sublime in a balloon. The final volume of the balloon is 1.00 L at 298 K. What is the pressure of the gas?
Give two reasons why the product is concentrated in the distillation flask during a continuous solid-liquid extraction. 2) what difficulties may be encounter during the determination of the melting point of caffeine?
A sample of oxygen gas is collected over water at 25 degrees C. and a total pressure of 654 torr. The volume of gas collected is 500 mL. What mass of oxygen is collected? The vapor pressure of water is 25 degrees C at 23.8 torr.
The water level in a graduated cylinder initially at 216 rises to 287 after a piece of lead is submerged. What is the mass in grams of the lead?
solution from a rebuilt auto baattery. How many milliliters of 1.4M NaHCO3 must be poured on the spill to react completely with the sulfuric acid?
The partial pressure and Henry's law constants for SO2 and H2O2 are 2.7 ppm (KH = 1.2 mol L-1atm-1) and 4.9 ppb (KH = 1.0E5 mol L-1atm-1), respectively. Calculate the reaction rate of this process.
Suppose that 150.2 J of heat energy is required to completely vaporize 5 g of a pure liquid. If the molar mass of the liquid is 95.64 g/mol, what is the molar enthalpy of vaporization of the liquid
A hydrogen atom is removed from the first carbon atom of a butane molecule and is replaced by a hydroxyl group. Draw the new molecule formed.
You have a 10.40-g mixture of table sugar (C 12 H 22 O 11) and table salt (NaCl). When this mixture is dissolved in 150. g of water, the freezing point is found to be-2.24°C. Calculate the percent by mass of sugar in the original mixture.
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