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Problem- A sample of I-131 has activity of 30 mCi. Its half-life is 8.08 days. Calculate activity at end of 20 days.
You must show your work in an efficient manner so I can understand it in clearly
calculate the specific heat of a metallic element if 478 J of energy are needed to raise the temp. of a 82.73 g sample from 25.0 C to 50.0 C. what is the most likely identity of the element
A reaction has an equilibrium constant of 8.2 X 10^3 at 298 K. At 764 K , the equilibrium constant is 0.53. Find Delta H rxn for the reaction.
sketch a graph of potential energy versus dihedral angle about the c-c bond of 12-dichloroethane. show the energy
Which is a principal product of this reaction. CH3OK + (CH3)3CBr ® A) CH3OC(CH3)3 B) CH2=C(CH3)2 C) CH3OCH3 D)
A compound forms between phosphorous and nitrogen. if 6.85 grams of phosphorous completely reacts with 5.15 grams of nitrogen, what is its empirical formula. show work in a table form.
If 22.50mL of 0.100 M nitric acid is required to neutralize 25.0 mL of barium hydroxide solution, what is the molar concentration of the base. HNO3 (aq) + Ba(OH)2(aq) --->Ba(NO3)2 (aq) + H2O (l)
A sample of neon effuses from a container in 79 seconds. The same amount of an unknown noble gas requires 161 seconds.
What are the empirical formula and the molecular formula of the compound.
Use the standard reduction potentials below to determine which element or ion is the best reducing agent
Calculate the energy that must be removed to convert substance X from a gas at 119°C to a solid -47.9°C. Assume X has a molar mass of 75.0 g/mol.
What wavelength of light would be absorbed in raising an electron from the second level to the third level.
When it is present in aqueous solution, the metal strontium, Sr, exists as an ion with a charge of +2. Given this information, state the chemical formula of the metal salt, strontium nitrate.
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