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Iridium-192 is one radioisotope used in brachytherapy, in which a radioactive source is placed inside a patient\'s body to treat cancer. Brachytherapy allows the use of a higher than normal dose to be placed near the tumor while lowering the risk of damage to healthy tissue. Iridium-192 is often used in the head or breast. Answer the following three questions (a, b, and c) based on the radioactive decay curve of iridium-192, shown below. Click on the graph and move the mouse over a point to get values for that point.
a) If the initial sample is 8.50 g, what mass of the original iridium-192 remains after 130 days?
b) Estimate the half-life of the radioisotope.
c) How many days would it take for one-fourth of the sample to decay?
The half of cesium-137 is 30.2 years. If the initial mass of sample of cesium-137 is 1,000 g, how much cesium will remain after 151 years.
A student is presented with a sample of an unknown substance and asked to classify the substance as organic or inorganic
How many moles of urea (60. g/mol) must be dissolved in 100. g of water to give a 1.9 molal solution?
The structure of HxWO3 could contain H+ ions or OH- ions. Which do you think is more likely? Why?
A single-stranded RNA phage replicates in E. coli with no DNA intermediates. The following experiments were performed to clarify the phage's mode of replication.
Calculate the approximate molecular mass of an unknown protein which had an elution volume of 9.0mL on the column.
The specific heat capacity of silver is 0.240 J/(g x degrees C). Calculate the energy (in kJ) required to raise the temperature of 263 g Ag from 273K to 278 K.
A typical aspirin tablet contains 325 mg of acetylsalicylic acid ( HC9H7O4). Calculate the pH of a solution that is prepared by dissolving five aspirin tablet(s) in one cup (237 mL) of solution. Assume the aspirin tablets are pure acetylsalicylic ..
A 40.2 L volume of methane gas is heated from 25°C to 86°C at constant pressure. What is the final volume of the gas?
2.00 moles of a gas occupies 62.2 L at a particular temperature and pressure. Its density is 0.900 g/L. The standard molar volume is 22.4 L/mole. What is the molar mass.
A chemist dissolves 0.9 g of an unknown monoprotic (one acidic H) acid in water. She finds that 14.6 mL of 0.426 M NaOH are required to neutralize the acid.
HEPES are synthetic amine compounds that are often used to make buffers for biochemical studies. What is the pH of a 1.0 L buffer solution that is 0.250M HEPES
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