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Calculate the initial concentrations of [SCN-] IONS and Fe3+ ions when a solution was prepared by mixing 3.00 more of 0.00280 M KSCN, 6.00 more of 0.250 M Fe(NO3)3 and 16.00 more of 0.050 M HNO3
How much does the molar enthalpy change when 147 g. of water cools from 90.0 C to 17.0 C when 20.0 g. of KCL is added to the water? Is this reaction exothermic or endothermic?
calculate the equilibrium constant ka for the ionization of formic acid in aqueous solution at 25 degrees celsius.
A hydrogen atom with an electron in its ground state interacts with a photon of light with a wavelength of 1.22 × 10-6m. Could the electron make a transition from the ground state to a higher energy level?
what is the density of a piece of wood that measures 3.0cm by 6.0cm by 4.0cm has a mass of 80.0g. what is the density of the wood ? would the piece of wood float on water.
During the late 1800's, hard rock miners replaced candles with carbide lamps for work in mine shafts. The lamps worked by dripping water onto calcium carbide that generated acetylene gas (H2C2) that was burned
11 g of sodium bromide NaBr is mixed with 9 g of butanol CH3CH2CH2CH2OH to yield 258 mg of bromobutane CH3CH2CH2CH2Br. Under the catalysis of 10 ml of sulfuric acid density 1.84g/ml.
Draw all of the possible constitutional and geometric isomers for monobromination of ethylcyclohexane. Label each isomer as chiral or achiral. Mark chiral centers with an asterisk (*).
A mixture of gases containing 0.40 mol of SO2 and 0.20 mol of O2 in a 4.0L flask reacts to form SO3. If the temperature is 25oC, what is the pressure in the flask after the reaction is complete
A reaction at 25C is known to standard changes in free energy, enthalpy and entropy of -38.4 kJ/mol.96.3kJ/mol
At 0.0 degrees C, if the volume of air is 1.5 mL and the pressure of the atmosphere that day is 685 mmHg, what is the number of moles of air?
What are the concentrations of HSO4-, SO42-, and H+ in a 0.14 M KHSO4 solution? (Hint: H2SO4 is a strong acid; Ka for HSO4- = 1.3 10-2.)
What mass of Mg is formed by passing a current of 5.50 A through molten MgCl2 for 2.80 days?
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