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Fluorine-18, which has a half-life of 110 min, is used in PET scans. If 123 mg of fluorine-18 is shipped at 8:00 a.m., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 p.m.?
Calculate the theoretical yield of C2H5Cl when 139 g of C2H6 reacts with 232 g of Cl2 , assuming that C2H6 and Cl2 react only to form C2H5Cl and HCl .
If a buffer solution is 0.260M in a weak base (Kb=5.6x10^-5) and 0.550M in its conjugate acid, what is the pH.
The vapor pressure of pure acetone (propanone) is 266 torr. When a non-volatile solute is added, the vapor pressure of acetone above the solution falls to 232 torr. What is the mole fraction of the non-volatile solute in the solution?
How many moles of phosphine (PH3) are produced for every 4.0 moles of hydrogen that react according to the chemical equation below?.
A solution is made by mixing exactly 500 mL of 0.180 M NaOH with exactly 500 mL of 0.100 M CH3COOH. Calculate the equilibrium concentration of the species
How many liters of H_2 would be formed at 704 mm Hg and 14 degrees C if 21.5 g of zinc was allowed to react?
The acid-dissociation constants of phosphoric acid (H3PO4) are Ka1 = 7.5 × 10-3, Ka2 = 6.2 × 10-8, 25) and Ka3 = 4.2 × 10-13 at 25.0 °C.
How many grams of MnSO4 can be prepared from the reaction of 15.0 g of KMnO4 with 22.6 g of H2SO3.
Assume that the complete combustion of one mole of ethanol to carbon dioxide and water liberates 1370 kJ/mol (?G°\' = -1370 kJ/mol). If the energy generated by the combustion of ethanol is entirely converted to the synthesis of a hypothetical comp..
If 158 mL of wet H2 is collected over water at 24C and a barometric pressure of 737 torr, how many grams of Zn have been consumed?
What is the molality of a solution formed by dissolving 1.70 mol of KCl in 15.0 mol of water (MM of water = 18.02 g/mol),
Mechanistic rationalization of the effect of the chloro substituent on reactivity (B) Propose an additional experiment to test your mechanistic rationalization IV.
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