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Vlad1618 [11]
3 years ago
15

13 A chemist made the table below to record some atomic properties of four elements. Properties of Elements Element Number of Pr

otons Number of Neutrons Total Number of Electrons Number of Electrons in Outer Shell B 5 5 5 3 9 10 9 7 Si 14 14 14 4 Ga 31 39 31 3 Based on the information in the table, which conclusion about the chemical reactivity of these elements is valid? A Boron is the most reactive because it has the most protons. B Fluorine is the most reactive because it has 7 electrons in the outer shell. c Silicon is the most reactive because it has an equal number of protons and neutrons. D Gallium is the most reactive because it has many more neutrons than protons. Madiam Cepeda ​
Chemistry
1 answer:
Alenkasestr [34]3 years ago
4 0

Answer:

B Fluorine is the most reactive because it has 7 electrons in the outer shell.

Explanation:

The valid conclusion about the reactivity of the elements is that fluorine is the most reactive because it has 7 electrons in the outer shell.

  • Reactivity of elements is in a bid to attain a stable configuration of their atoms.
  • Fluorine belongs to group 7 on the periodic table.
  • To complete its octet, it requires just one electron.
  • This makes it very reactive
  • On getting an electron, it becomes like the nearest noble gas, Neon.
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The mass of the aluminum sulfide, Al₂S₃, that can be produced from the reaction is 14.16 g

<h3>How to determine the mole of Al(NO₃)₃</h3>
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Mole = Molarity x Volume

Mole of Al(NO₃)₃ = 1.51 × 0.125

Mole of Al(NO₃)₃ = 0.18875 mole

<h3>How to determine the mole of Al₂S₃ produced </h3>

Balanced equation

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From the balanced equation above,

2 moles of Al(NO₃)₃ reacted to produce 1 mole of Al₂S₃

Therefore,

0.18875 mole of Al(NO₃)₃ will react to produce = 0.18875 / 2 = 0.094375 mole of Al₂S₃

<h3>How to determine the mass of Al₂S₃ produced </h3>
  • Mole of Al₂S₃ = 0.094375 mole
  • Molar mass of Al₂S₃ = (27×2) +(32×3) = 150 g/mol
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Mass = mole × molar mass

Mass of Al₂S₃ = 0.094375 × 150

Mass of Al₂S₃ = 14.16 g

Learn more about stoichiometry:

brainly.com/question/14735801

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