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steposvetlana [31]
3 years ago
10

Which element is the excess reagent when 3.00 moles of Mg is ignited in 2.20 moles of pure oxygen

Chemistry
1 answer:
Artyom0805 [142]3 years ago
7 0

Answer:

Oxygen is in excess.

Explanation:

The coefficients of the balanced equation create a mole ratio that shows the ratio of how many reactants are used up and products are created.  

The mole ratio of Mg to O2 in this equation is 2:1, which means that for every two moles of Mg used, there will be 1 mole of O2 used.

If we have 3.00 moles of Mg, we will only need 1.5 moles of oxygen to completely burn the Mg. Therefore, when all 3.00 moles of Mg are used, there will still be some of the 2.20 moles of oxygen remaining.

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notsponge [240]

Answer:

There are 9 electrons in this atom.

Explanation:

Electron configuration of this atom: 1s^2\, 2s^2\, 2p^5.

The electron orbitals of an atom are denoted as 1s, 2s, 2p, 3s, 3p, etc. At any given time, an electron in this atom is located in exactly one orbital.

The electron configuration of an atom gives the number of electrons in each orbitals of this atom.

For example, in this atom, the superscript "2" on the right of "1s" means that there are two electrons in the 1s\! orbital of this atom. Hence, 1s^2\, 2s^2\, 2p^5 would translate to:

  • The 1s orbital of this atom contains 2 electrons.
  • The 2s orbital of this atom contains 2 electrons.
  • The 2p orbitals of this atom contain 5 electrons.

Hence, there would be 2 + 2 + 5 = 9 electrons in total in this atom.

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Answer:

(c.) as the force of Earth's gravity on an object increases, the object's mass increases

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It is mathematically expressed as:

    F = \frac{Gm_{1} m_{2} }{r^{2} }

F is the gravitational force on either particle

m₁ and m₂ are the masses

r is the distance between particles

G is the universal gravitation constant.

From this expression, we see that the force of earth's gravity is directly proportional to mass.

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