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3 years ago

Determine the molarity of the sodium ions when 78.0 g Na2S is dissolved in water for a final volume of 1.0 L.

Chemistry

1 answer:

olga55 [171]3 years ago

5 0

Answer:

[Na⁺] = 1.99 M

Explanation:

Na₂S is a ionic salt that can be dissociated.

Dissociation equation is:

Na₂S → 2Na⁺ + S⁻²

1 mol of sodium sulfide can give 2 moles of sodium cation.

We convert moles of salt: 78 g . 1mol / 78.06 g = 0.999 moles

As ratio is 1:2, after dissociation we have (0.999 . 2) = 1.998 moles of Na⁺

Molarity is a type of concentration.

It indicates moles of solute in 1 L of solution and in this case, we have 1 L as final voulme.

Moles of Na⁺ are 1.998 moles. Then molarity (mol/L) is:

M =1.99 mol/L

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Answer:

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Which label belongs in the region marked X?

lubasha [3.4K]

Answer:

A) involves changes in temperature

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The figure is missing, but I assume that the region marked X represents the region in common between Gay-Lussac's law and Charle's Law.

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A) involves changes in temperature

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7 0

3 years ago