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Calculate the pH of a solution prepared by mixing 50mL of a 0.10 M CH3NH2 solution with 25mL of a .20M HCl solution. (Kb CH3NH2 = 4.4 x 10^-4)
A 250 g yo-yo is swung on the end of a50 cm string at a constant speed of 4 m/s. What is the centripetal force acting on the yo-yo?
A mixture of propane and butane is fed into a furnace where it is mixed with air. The furnace exhaust leaves the furnace at 337°C, 786.0 mmHg and contains only N2, O2, CO2, and H2O
Which stage of ionization usually produces more ions and why?
What mass of HClO4 should be present in 0.600 L of solution to obtain a solution with a pH of 2.50?
Metals such as magnesium and zinc react with dilute sulfuric acid to give hydrogen, according to the equation: M (s) + H2SO4 (aq) -------> MSO4 (aq) + H2 (g) When 5.00 g of a mixture of powdered magnesium and zinc were dissolved in diluted sulfuri..
Calculate the density of N2 at STP, (a) using the ideal-gas law and (b) using the molar volume and molar mass of N2.
Propose mechanisms for the formation of fragments with m/z 69, 43 and 41 in the mass spectra of CH3CH=CHC(O)CH3 and briefly explain the absence of fragments from the McLafferty rearrangement.
A student placed 20.0 g of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100. mL mark on the neck of the flask was reached.
What does a yellow flame in the Bunsen burner indicate? How can this be corrected? Why use a funnel to transfer large volume of liquid from one container to another?
What volume of O2, measured at 25C and 1.00atm, is expelled when 425ml of water saturated with O2 is heated from 0 to 25C?
A gas mixture with a total pressure of 770 contains each of the following gases at the indicated partial pressures: , 265 ; , 134 ; and , 159 . The mixture also contains helium gas. What is the partial pressure of the helium gas?
Ammonia is often produced by reacting nitrogen gas with hydrogen gas. How many liters of ammonia gas can be formed from 23.5 L of hydrogen gas at 93.0°C and a pressure of 34.7 kPa?
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