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Calculate the wavelength, in naniometers, of the spectral line produced when an electron in a hydrogen atom undergoes the transition from the energy level n=3 to the level n=1.
Write ionic and net ionic equations for the following reactions. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer.)
Using a solution containing 0.302 grams of an antibiotic has an osmotic pressure of 8.34 mmHg At 23.6°C, 0.500 L. calculate its molecular mass.
Using the calibration data provided below, calculate the concentration of cocaine (mg/mL) in the original urine sample.
a 155 gram sample of copper was heated to 150 degrees Celsius then placed into 250 gram of water at 19.8 degrees Celsius. Calculate the final temperature of the mixture.
What volume will contain 5.0 mol of aluminium? The density of aluminium is 2.7 g/ml.
Consider equal volumes (say 1 rm L) of a substance in the solid, liquid, and gas phases. Arrange them in order of decreasing mass. If the mass difference between samples is relatively small, rank the items as equivalent.
The density of so-called "heavy water"=1.1053 g/mL at 20 0C. determine what would be the mass of the flask when filled with heavy water?
What mass of CaCO3 will produce 8.0 L of CO2, measured at standard temperature and pressure conditions? Molar mass of CaCO3 = 100. g per mole.
56.9 mL of water is added to 24.9 mL of 0.125 M KOH solution. What is the new molarity?
The activation energy for the isomerization of methyl isonitrile (see figure) is 160 kJ/mol. Calculate the fraction of methyl isonitrile molecules that has an energy of 160.0 kJ or greater at 493 K.
A solution is made by mixing 15.5 g of NaOH and 73.0 mL of 0.150 M HNO3. Calculate the concentration of OH- ion remaining in solution.
What mass of water (in grams) forms from the reaction of 2.49 L of hydrogen gas and 1.92 L of oxygen gas? Both gases are at 738 torr and 27.3 oC
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