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Verizon [17]
3 years ago
5

Na2SO4 is dissolved in water to make 450mL of a 0.2250 M solution. What is the molar mass of Na2SO4?

Chemistry
1 answer:
Alisiya [41]3 years ago
3 0

Answer:

mass Na2SO4 = 14.3816 g

Explanation:

sln Na2SO4:

∴ V = 450 mL

∴ <em>C </em>=<em> </em>0.2250 mol/L

∴ Mw ≡ 142.04 g/mol.....  from literature

⇒ mol Na2SO4 = (0.2250 mol/L)(0.450 L) = 0.10125 mol

⇒ mass Na2SO4 = (0.10125 mol)(142.04 g/mol) = 14.3816 g

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Answer:

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How many milliliters of water are needed to prepare a 3.5M solution of NaOH if you have .5mol of the solute
Mamont248 [21]

Answer:

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From the molarity formula we can first calculate the volume of the solution:

M=\frac{solute moles}{solution volume}

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The volume of the solution as we said previously is:

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To determine the volume of the solute we first obtain the grams of NaOH through the molecular weight formula:

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Having the volume of the solution and the volume of the solute, the volume of the solvent H2O can be calculated:

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Solvent volume = 1429 mL -  93.88 mL = 1335.12 mL of H2O

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Answer:

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Answer:

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