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A 30.5 g sample of an alloy at 91.8°C is placed into 50.5 g water at 22.1°C in an insulated coffee cup. The heat capacity of the coffee cup (without the water) is 9.2 J/K. If the final temperature of the system is 31.1°C, what is the specific heat capacity of the alloy? (c of water is 4.184 J/g×K)
The pKa values of a compound with two ionizable groups are pKa1 = 4.10 and pKa2 between 7 and 10. A biochemist has 10 mL of a 1.0 M solution of this compoud at a pH of 8.00. She adds 10.0 mL of 1.00 M HCl,
What was the percentage by mass of Mg(OH)2 in the original sample. When Mg(OH)2 or Al(OH)3 reacts with HCl(aq), the products are a chloride salt, water and CO2(g)
A sample of chlorine gas in confinedin a 5.9L container at 220. torr and 27 degrees Celsius. How many moles of gas are present in the sample?
Take element Z = 57 from the periodic table. Ionize it 56 times so that there is only one electron left orbiting around the nucleus. What is the ground state energy of the electron
Calculate the mass of CuS produced and the concentration of H+ ion produced by bubbling H2S into 1.00 L of 0.10 M CuCl2 (aq) solution. The net ionic equation is:
A sample of Nitrogen gas expands in volume fro 1.6 L to 5.4 L at constant temperature. Calculate the work done (in joules) if the gas expands
If the laser is pointed toward a pinhole with a diameter of 1.0 mm, how many photons will travel through the pinhole per second? Assume that the light intensity is equally distributed throughout the entire cross-sectional area of the beam. (1 W = ..
The barometric air pressure that day was 733 mm Hg. What is the pressure of the vapor inside the flask (in atmospheres) after the vapor had cooled and the students opened the flask momentarily?
Identify the nuclide produced when americium-241 decays by alpha emission, 241 / 95 Am→ 4 / 2 He + ? Express your answer as an isotope using prescripts.
what is the relationship between the carbon to nitrogen bond lengths and bond order for HCN molecule
Draw the two possible products of the reaction between benzaldehyde and ethylpropylketone
Differentiate between alkenes and alkynes, cis isomers and trans isomers. Describe how cis- trans isomers are used for night vision.
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