Chemistry Answers

For the following reaction at 373 K, Kc = 0.50. If the initial concentration of N2O4 is 0.152 M, what is the equilibrium concentration of NO2?

N2O4 (g) ⇆ NO2 (g)

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The four successive ionization energies for an unknown element are;

I1=896kJ/mol

I2=1752kJ/mol

I3=14807kJ/mol

I4=17948kJ/mol

To which family in the periodic table does the unknown element most likely belong?

 A real gas behaves most like an ideal gas under the following conditions:

Steel wool , which is made of pure iron metal, burns with oxygen gas to produce ferric oxide (Fe2O3). Fe(s) + O2(g) ( Fe2O3

If there are 1.25 moles of Fe and 1.25 moles of O2,

How many moles of Fe2O3 will be produced? What is its mass?

If the actual laboratory yield is 95.8g Fe2O3, what is the rection’s percent yield?

20cm^3 of carbon dioxide has sparked with 20cm^3 of oxygen. If all the volume of gases are measured at stp calculate the volume of residual gas after sparking

Chemcial Equation: C3H8 + O2 ( CO2 + H2O

If 50.0 grams of Cl2 gas is reacted with enough sodium hydroxide (NaOH), calculate the following:

Mass in grams of sodium hypochlorite (NaOCL) produced

Moles of sodium chloride (NaCl) produced

Chemical Equation: NaOH + Cl2 ( NaOCl + NaCl + H2O

Calculte the number of moles in200g of O gas

I am trying to understand electron configuration backfilling because I see that there is 2,8,16,2 for NI then it skips to 2,8,18,1 for CU

some say CU is 2, 8, 18, 1 and others say CU is 2, 8, 17, 2

Then I heard the atoms holds 8 electrons and fills 17 (What is the difference between hold and fill)

also don't see how the 3rd row when move it up to the 3rd row, how the numbers fit in sequence?

• From 1 part of the question, which is the hold and fill. I think it means that to fill would be referring to bonding with other atoms 

• but then again according to this definition I still don't understand: A stable arrangement is attended when the atom is surrounded by eight electrons. This octet can be made up by own electrons and some electrons which are shared. Thus, an atom continues to form bonds until an octet of electrons is made. This is known as octet rule by Lewis.

If I have electron configuration, I have to fill 4s first then 3d. Does that mean 4s energy is lower than 3d? Also, does that mean that in the 4th shell electron orbit the atom will receive 2 electrons first (due to fulfill the 4s subshell) and then fill 10 electrons into the 3rd atomic shell (due to fulfill the 3d subshell)? Thank you.