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Fluorine-18 is an isotope used in Positron Emission Tomography (PET) to scan the brain and follows first-order decay kinetics. If a researcher has 1.50 μg of 18F, how long before it decays to 1.0 ng? The half-life of 18F is 109.8 minutes.

The decomposition of dinitrogen pentoxide is described by the chemical equation 2 N2O5(g) → 4 NO2(g) + O2(g) If the rate of appearance of O2 is equal to 2.40 mol/min at a particular moment, what is the rate of disappearance of N2O5 at that moment?

A three-step mechanism has been suggested for the formation of carbonyl chloride:What is the molecularity of the rate-determining step?

The decomposition of dinitrogen pentoxide is described by the chemical equation 2 N2O5(g) → 4 NO2(g) + O2(g) If the rate of appearance of O2 is equal to 2.40 mol/min at a particular moment, what is the rate of disappearance of N2O5 at that moment?

The aquation of tris(1, 10-phenanthroline)iron(II) in acid solution takes place according to the equation: Fe(phen)32+ + 3 H3O+ + 3 H2O → Fe(H2O)62+ + 3 phenH+ If the activation energy, Ea, is 126 kJ/mol and the rate constant at 30°C is 9.8 × 10-3 min-1, what is the rate constant at 50°C?

Hydrogen bromide will dissociate into hydrogen and bromine gases.               2HBr(g) ↔  H2(g) + Br2(g)                                      ∆H°rxn = 68 kJ What effect will a temperature increase of 50°C have on this system at equilibrium?

At high temperatures, carbon reacts with O2 to produce CO as follows:                             C(s) + O2(g)  —->  2CO(g). When 0.350 mol of O2 and excess carbon were placed in a 5.00-L container and heated, the equilibrium concentration of CO was found to be 0.060 M. What is the equilibrium constant, Kc, for this reaction?

The hydrolysis of tert-butyl chloride is given in the reaction below: (CH3)3CCl(aq) + H2O(l) → (CH3)3COH(aq) + H+(aq) + Cl-(aq) If the rate law is: Rate = k[(CH3)3CCl], what is the order of the reaction with respect to water?

The aquation of tris(1, 10-phenanthroline)iron(II) in acid solution takes place according to the equation: Fe(phen)32+ + 3 H3O+ + 3 H2O → Fe(H2O)62+ + 3 phenH+ If the activation energy, Ea, is 126 kJ/mol and the rate constant at 30°C is 9.8 × 10-3 min-1, what is the rate constant at 50°C?

Hydrogen bromide will dissociate into hydrogen and bromine gases.               2HBr(g) ↔  H2(g) + Br2(g)                                      ∆H°rxn = 68 kJ What effect will a temperature increase of 50°C have on this system at equilibrium?