The half-life of lodine-131 (I-131) is 8 days. If 294 grams of I-131 were released to the environment, how many grams will remain of it after 21.7 days?
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- One gram of methane is burned, and the heat is used to raise the temperature of 1 kg of water. If the initial temperature of the water is 25C, what is the final temperature?The half-life of cesium-137 is 30 years. Suppose we have a 60-mg sample. (a) Find the mass that remains after t years.y(t) = (b) How much of the sample remains after 60 years? (Round your answer to two decimal places.) (c) After how long will only 1 mg remain? (Round your answer to one decimal place.)t =Thallium-201 is used medically to diagnose heart problems. What is the half-life of thallium-201 if 148 hours are required for the activity of a sample of thallium-201 to fall to 24.6 percent of its original value?
- Initially 100 mg of a radioactive substance was present. After 6 hours the mass had decreased by 3%. If the rate of decay is proportional to the amount of substance present at time t, determine the half-life of the substance.A certain radioactive material follows the law of exponential growth. If between noon and 2 pm the population triples, at what time should the population become 100 times what it was at noon?A sample of solid iodine is heated with an electrical coil. If 72.7 Joules of energy are added to a 13.1 gram sample initially at 23.5°C, what is the final temperature of the iodine?
- The change in internal energy for the combustion of 1.0 mol of octane at a pressure of 1.0 atm is -5084.3 kJ . If the change in enthalpy is -5074.0 kJ , how much work is done during the combustion? Express the work in kilojoules to three significant figures.Adsorption of methane follows the Langmuir adsorption isotherm at 90K. If P = 1.896 cm3/g/bar and b = 0.146 bar-1. Calculate the value of θ.(a) What is the physical significance of energy of activation ? Explain with diagram.(b) In general, it is observed that the rate of a chemical reaction doubles with every 10 degree rise in temperature. If the generalization holds good for the reaction in the temperature range of 295 K to 305 K, what would be the value of activation energy for this reaction ?[R = 8.314 J mol-1 K-1]
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