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Amateur radio operators in the United States can transmit on several bands. One of those bands consists of radio waves with a wavelength near 20.m . Calculate the frequency of these radio waves. Be sure your answer has the correct number of significant digits.
Estimate the average rate of production (Using this rate) of oxygen over the same time period. Considering the given equation 2H 2 O 2 --> 2H 2 O+O 2 -H 2 O 2
The half-life for the second order reaction of a substance A is 55 seconds when [A]o is 0.84 M. What time is needed for the concentration to decrease to 1/4 of the original value.
Compute the mass of an electron if the difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 grams?
Determine how many milligrams of H 2 O are present in sample If the freezing point of a 100.0g sample of 2-methyl-2-propanol =24.59C?
Calculate the percent yield for an experiment in which 5.50 g of SOCl2 was obtained in a reaction of 5.80 g of SO2 with excess PCl5
Lead(II) sulfide reacts with hydrogen peroxide to form lead(II) sulfate and water. How many grams of hydrogen peroxide are needed to react completely with 265 g of lead(II) sulfide.
Calculate the ratio of CH 3 NH 2 to CH 3 NH 3 Cl required to create a buffer with pH = 10.14. Express your answer using two significant figures.
The initial mass of the the crude ether was 141 mg. The mass after recrystallization was 121 mg. Calculate the percent recovery from recrystallization.
If you a litre (1000mL) bottle of oil in your engine, how much heat is produced in kcal?In BTU To solve this problem you must know the density of motor oil is .82 g/mL.
A gaseous mixture of Oxygen(O2 )and Nitrogen(N2 )contains 40.8 grams N2(nitrogen) by mass then determine what is the partial pressure of O2(oxygen) in the mixture if the total pressure is given= 345 mmHg.
4 KO2 + 2 H2O + 4 CO2 4 KHCO3 + 3 O2 1.86 moles of O2 were produced.Now, How many molecules of O2 does this number of moles represent.
How many grams of Fe(NO3)3 · 9 H2O are required to prepare 300.0 mL of a 0.249 M solution of Fe(NO3)3 · 9 H2O?
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