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Calculate the energy and the wavelength, in nanometers, of light emitted when an electron in an excited hydrogen atom falls from the n=2 level to the n = 1 level.
container Ais filled with air at STP, it is then inserted into a large enclosed container B, which is then flushed with H2(g), what will happen to the pessure inside container A? explain your answer.
What mass of iron would be required to cover a football playing surface of 120 yds × 60 yds to a depth of 1.0 mm?
8 ml of the HCl was used to titrate the pK_a 3.8 group; so 2 ml was enough to titrate the rest of the high pK_a group. The upper pK_a group must have begun the experiment as 80% acid form, 20% base form.
A gas held at 798 mmHg in a 400 mL flask is released into a 3 L flask.Whats the new gas pressure?
What mass of this substance must evaporate in order to freeze 230 of water initially at 24? (The heat of fusion of water is 334 the specific heat of water is 4.18 .)
What is the Total Ionic Equation for:2Al + 2KOH + 6H2O = 2KAl(OH)4 +3H2
A 4.78- sample of aluminum completely reacts with oxygen to form 6.67 of aluminum oxide. Use this data to calculate the mass percent composition of aluminum in aluminum oxide.
if you used 8900 kilojoules you expend in energy in one day to heat 49000g of water at 19 C what would be the rise in temperature.
Radioactive radon gas (222Rn) enters an average building at a rate of 5 picocuries per second per square meter of foundation area. Consider a house with a foundation of 400 square meters and a volume of 1000 cubic meters.
Calculate how many kilojoules of energy are released when 27.86g of butane are burned.
Determine the mass of the steel bar if the final temperature of the system is twenty one degree Celsius?
A cannonball made of iron has a volume of 115 cm3. If iron has a density of 7.86 g/cm3, what is the mass in grams of the cannonball?
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