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A 130-mg sample of technetium-99 m is used for a diagnostic test. If technetium-99 m has a half-life of 6.0 h, how many milligrams of the technetium-99 m sample remains active 30 h after the test?
Express your answer to two significant figures and include the appropriate units.
What is the balanced net ionic equation. 2Nh4Cl (aq) + Ba(OH)2 (aq) --> 2H2O (l) + BaCl2 (aq) + 2NH3 (aq)
How many peaks would you expect to find in the NMR spectrum of caffeine? What characteristic absorption bands would you expect to find in the infrared spectrum of caffeine?
consider the following equalibrium: C2H6(g) + C5H12(g) CH4(g) + C6H14(g); Kp = 9.57 at 500K. Suppose 14.2 g each of CH4,C2H6,C5H12 and C6H14 are placed in a 25.0-l reaction vessel at 500 K. What is the value of Qp
provide mechanism for trans-1-bromo-2-methylcyclohexane rxn under e1 conditions
hydrochloric acid is sold as a concentrated aqueous solution. if the molarity of commercial hcl is 12.0 and its density
What total volume of ozone measured at a pressure of 21.0 {\rm mmHg} and a temperature of 227 {\rm K} can be destroyed when all of the chlorine from 12.0 {\rm g} of {\rm{CF}}_3 {\rm{Cl}} goes through ten cycles of the above reactions
A molecule with a chiral center must be optically active whereas a molecule with two chiral centers may or may not be optically active. Explain and provide examples.
175g of water was heated from 15 degrees to 88 degress celsuis. how many kilocalories were absorbed by the water?
The following statements describe some physical and chemical properties of sucrose (table sugar). Which response includes all that describe chemical properties, and none that describe physical properties?
Calculate the molar mass of the biomolecule. for carbon tetrachloride, the boiling-point constant is 5.03 degrees C x kg/mol, and the boiling point of pure carbon tetrachloride is 76.50 degrees C.
A 4.00 g sample of an aluminum-copperalloy reacts with excess hydrochloric acid. The 2.81 L of H2(g) produced is collected over water at a barometric pressure of 758.4 mmHg and 19°C. What is the mass percent of aluminum in the alloy
A sample of 1-naphthoic acid is contaminated with a small amount of sand and NaCl. Using active extraction (changing the polarity) and a gravity filtration to remove a component, describe how you would obtain pure naphthoic acid from this mixture.
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