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NNADVOKAT [17]
4 years ago
15

how is the concept of effective nuclear charge used to simplify the numerous electron-electron repulsions in many-electron atom

Chemistry
1 answer:
kvv77 [185]4 years ago
8 0
We need more information to help please provide me with more information then @me when you do . ill be glad to help!
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Balance the following reaction and use the equation to calculate the ΔHrxn. C3H8(g) + O2(g) → CO2(g) + H2O(g) Round your answer
gladu [14]

The reaction corresponds to the combustion of propane (C3H8). The balanced reaction is:

C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)

The reaction enthalpy is given as:

ΔHrxn = ∑nΔH°f(products) - ∑ nΔH°f(reactants)

          = [3ΔH°f(CO2(g)) + 4ΔH°f(H2O(g)] - [1ΔH°f(C3H8(g)) + 5ΔH°f(O2(g)]

          = [3(-393.5) + 4(-241.8)] - [-103.9 + 5(0)] = -2043.8 kJ

The enthalpy for the combustion of propane is -2044 kJ

4 0
3 years ago
The density of a gold nugget is 19.3 g/cm3. If the volume of the gold nugget is 0.00369 L the mass of the nugget is
Sauron [17]

Answer:

The answer to your question is 71.22 g

Explanation:

Data

Density = 19.3 g/cm³

Volume = 0.00369

mass = ?

Formula

Density = \frac{mass}{volume}

Solve for mass

mass = density x volume

Process

1.- Convert volume from liters to cubic centimeters

                 1 l ----------------  1000 cm³

             0.00369l ---------   x

                x = (0.00369 x 1000 ) / 1

                x = 3.69 cm³

2.- Substitution

       mass = 19.3 x 3.69

3.- Simplification and result

       mass = 71.22 g

6 0
3 years ago
Which of the following is true about chemical bonds?
Sauron [17]
I really don’t know. Sorry
7 0
3 years ago
Read 2 more answers
in the reaction mgcl2+2koh mg(oh)2 +2kci IF 1 MOLE MGCL2 IS added to 3 moles koh what is the limiting reagent
Anna71 [15]
<span>For 1 mole of MgCl2, it would require 2 moles of KOH. ( 1 : 2 mole ratio) 

Since you have 3 moles of KOH, it is in excess, and MgCl2 is the limiting reactant.</span><span>
</span>
3 0
3 years ago
Read 2 more answers
13. Hydrogen and helium have both been used to fill balloons. Which property of helium
Zolol [24]

Answer:

Helium is lighter than Hydrogen and Helium is a much safer gas.

8 0
4 years ago
Read 2 more answers
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