The breakdown of a certain pollutant X in sunlight is known to follow first-order kinetics. An atmospheric scientist studying the process fills a 20.0Lreaction flask with a sample of urban air and finds that the partial pressure of X in the flask decreases from 0.473atm to 0.376atm over 5.6hours. Calculate the initial rate of decomposition of X, that is, the rate at which Xwas disappearing at the start of the experiment.

Round your answer to 2 significant digits.

0.019 atm / hr

Explanation:

Initial Concentration (Pressure) [A]o = 0.473 atm

Final Concentration (Pressure) [A] = 0.376 atm

Time = 5.6 hours

The breakdown follows first order kinetics.

The integrated rate law for a first order reaction is given as;

ln[A] = ln[A]o - kt

ln(0.376) = ln(0.473) - k (5.6)

ln(0.376) - ln(0.473) = - 5.6 k

5.6 k = 0.23

k = 0.0411 hr⁻¹

The rate of decomposition is given as;

Rate = k [X]

Where [X] represents Concentration (Pressure) = 0.473 atm

Rate = 0.0411 * 0.473 = 0.019 atm / hr

the formula would be mgso4

mgso[subscript]4

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.