A pressure cooker contains 5.68 liters of air at a temperature of 394 K. If the absolute pressure of the air in the pressure cooker is 205 pascals, how many moles of air are in the cooker? The cooker contains moles of air.

The question is incomplete. The value for the absolute pressure of air in the pressure cooker is 205 kilopascals I.e. 205, 000 pascals not 205 pascals.

The answer is n= 0.355 mol

Explanation:

The ideal gas equation will be used to solve this question. The ideal gas equation is:

PV=nRT

Where; P = absolute pressure

(atm)

V = Volume (Litres)

n = no. of moles

R = ideal gas constant

(0.0821 L atm/ mol K)

T = absolute temperature

(K)

According to this question, V= 5.68L, P= 205 Kpa, T= 394K

However, the unit of pressure must be converted to atm

1 atm = 101325pa

Hence, 205000 pa will be 205000/101325 atm

= 2.02 atm

Since, n in the equation PV=nRT is being sought for, we make "n" subject of the formula. Thus, n = PV/RT

n = 2.02 × 5.68 / 0.0821 × 394

n = 11.4736 / 32.3474

n = 0.355 mol

Thus, The pressure cooker contains 0.355 moles of air.

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.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.