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A 25.0 mL sample of 0.20 mol L-1 HNO2(aq) is titrated with 0.20 mol L-1 KOH(aq) at 25oC. What is the pH AT THE Equivalence point?(FOR HNO2,Ka=4.50x10^-4 at 25oC)
How many electrons are transferred between the cation and anion to form the ionic bond in one formula unit of each compound? (1 electrons, 2 electrons, 3 electrons, 4 electrons)
Find the mathematical relationship that relates energy of a photon emitted as an electron relaxes from a higher energy level to a lower energy level in a hydrogen atom. Use this equation to calculate the wavelength of the photon emitted in units o..
What was the percentage by mass of Mg(OH)2 in the original sample? [Hint: When Mg(OH)2 or Al(OH)3 reacts with HCl(aq), the products are a chloride salt, water and CO2(g). Assume that all of the CO2(g) leaves the solution without reacting.]
A gas undergoes a process that leads to a change in internal energy of 4.5 J, while simultaneously work in the amount of 17.6 J is performed by the gas at constant pressure. Calculate the change in enthalpy of this process.
Osmium has a density of 22.6 g/cm3. What volume (in cm3) would be occupied by a 21.8 g sample of osmium?
1) What volume (mL) of Hydrogen gas, saturated with water vapor, will be obtained from a 0.1138g sample of alloy which is 73.2 percent Al? (Pbar=754.3 torr, T=21.2deg C) Show your work. 2) What volume (in mL) will the dry hydrogen gas from questio..
A 322 mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 635 mmHg. Calculate the moles of Ar present.
a mixture of 0.0319 g hydrogen and 0.0178 mol oxygen in a closed container is sparked to initiate a reaction. how many
What is the total pressure in a 10.0 L container that contains 0.56 g of SF6, 2.3 g of NO, and 1.23 X 10^23 g of Co molecules at 300K
Using information from the table of Standard Thermodynamic Data, calculate the equilibrium constant, Keq, for the reaction given below at 298 K.
The half-equivalence point of a titration occurs half way to the end point, where half of the analyte has reacted to form its conjugate, and the other half still remains unreacted.
Container A holds 727 mL of ideal gas at 2.20 atm. Container B holds 134 mL of ideal gas at 4.20 atm. If the gases are allowed to mix together
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