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?

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?

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, what is the order of the reaction with respect to water?

The decomposition of ozone in the stratosphere can occur by the following two-step mechanism:Which species is a catalyst in this mechanism?

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?

A mixture of carbon monoxide, hydrogen, and methanol is at equilibrium. The balanced chemical equation is: CO(g) + 2 H2(g) ⇌ CH3OH(g). At 250°C, the mixture contains 0.0960 M CO, 0.191 M H2, and 0.150 M CH3OH. What is the value for Kc?

The oxidation of sulfur dioxide by oxygen to sulfur trioxide has been implicated as an important step in the formation of acid rain: 2 SO2(g) + O2(g) ⇌ 2 SO3(g). If the equilibrium partial pressures of SO2, O2, and SO3 are 0.564 atm, 0.102 atm, and 0.333 atm respectively at 1000 K, what is Kp at that temperature?