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meriva
3 years ago
11

Which of the following elements ia an alkali metal?

Chemistry
2 answers:
Delicious77 [7]3 years ago
8 0

That would be potassium. The alkali  metals are in Group 1 of the Periodic Table.  Some others in that Group are Lithium, Sodium, and  Rubidium

Anna11 [10]3 years ago
7 0

A) Potassium

Potassium contains the six chemical elements that make it an alkali metal?

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A chemist has to prepare 250.0 mL of a 0.300 M Na2SO4(aq) solution. What mass, in grams, of sodium sulfate (formula mass 142.05
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The mass of sodium sulphate, Na₂SO₄, required to prepare the solution is 10.65 g

<h3>How to determine the mole of sodium sulphate Na₂SO₄</h3>
  • Volume = 250 mL = 250 / 1000 = 0.25 L
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Mole = Molarity x Volume

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Mole of Na₂SO₄ = 0.075 mole

<h3>How to determine the mass of sodium sulphate Na₂SO₄</h3>
  • Molar mass of Na₂SO₄ = 142.05 g/mol
  • Mole of Na₂SO₄ = 0.075 mole
  • Mass of Na₂SO₄ =?

Mass = mole × molar mass

Mass of Na₂SO₄ = 0.075 × 142.05

Mass of Na₂SO₄ = 10.65 g

Thus, 10.65 g of Na₂SO₄ is needed to prepare the solution.

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brainly.com/question/15370276

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