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Radium-226 (atomic mass = 226.025402 ) decays to radon-224 (a radioactive gas) with a half-life of 1600 years. What volume of radon gas (at and 1.0 ) is produced by 28.0 of radium in 5.0 days?
determine the amount of heat (in kJ) given off when 1.42 * 10^4 g of NO2 is produced according to the following equation : 2 No(g) + o2(g) --> 2NO2(g) H = -114.6kj
The annual production of zinc sulfide (ZnS) is 5.5 104 tons. Estimate the number of tons of SO2 produced by roasting it to extract zinc metal in TONS
What is the empirical formula of the compound if Quantitative analysis of a 5.00-g sample of a gaseous compound yielded the following results: 2.00 g sulfur and 3.00 g oxygen?
Describe the procedure for conducting a melting point experiment. Include the names of the equipment used and the observations you could expect to make.
Nitrogen boils at -320F What is the temperature on the Celsius scale. Please show your solution to problem
Determine the value of Faraday used If the electrolysis was carried out for eighty minutes with a current of four amperes flowing
5000 joules of energy are added to 108 grams of silver ag at 20degc. what is the final temperature of the metal? the
Ethan contain 2.659 carbon and .668 gm of H, and one sample of acetylene contains 4.59 g of carbon and .382 gm of h. write emperical formula for ethane , acetylene
A solid mixture weighing 1.372 grams and containing only sodium carbonate and sodium bicarbonate required 29.11mL of 0.734M HCL for a complete titration. what is the grams of sodium carbonate and sodium bicarbonate in this mixture
Fluorine-18 undergoes positron emission with a half-life of 1.10 x 102 minutes. If a patient is given a 248 mg dose for a PET scan, how long will it take for the amount of fluorine-18 to drop to 83 mg
Which of the following would be expected to have the lowest freezing temperature?
A certain weak base has a Kb of 7.80 × 10-7. What concentration of this base will produce a pH of 10.16
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