Calculate the number of co2 molecules ( nco2) in 0.0693 mol of co2

0.42×10²³ molecules of CO₂.

Explanation:

Given data:

Number of moles of CO₂ = 0.0693 mol

Number of molecules of CO₂ = ?

Solution:

The given problem can be solve by using the Avogadro number.

Avogadro number is the number of atoms , ions and molecules in one gram atom of element, one gram molecule of compound and one gram ion of substance.

The number 6.022×1023 is called Avogadro number.

1 mole of CO₂ contain 6.02 ×10²³ molecules of CO₂

0.0693 moles of CO₂ contain = 0.42×10²³ molecules of CO₂

0.0693× 6.02 ×10²³ = 0.42×10²³

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"

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.