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Ratling [72]
2 years ago
6

In a titration of 35.00 mL of 0.737 M H2SO4, __________ mL of a 0.827 M KOH solution is required for neutralization.

Chemistry
1 answer:
elena55 [62]2 years ago
4 0

Answer:

In a titration of 35.00 mL of 0.737 M H₂SO₄, 62.4 mL of a 0.827 M KOH solution is required for neutralization.

Explanation:

The balanced reaction is

H₂SO₄  +  2 KOH  ⇒  2 H₂O  +  K₂SO₄

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction)  1 mole of H₂SO₄ is neutralized with 2 moles of KOH.

The molarity M being the number of moles of solute that are dissolved in a given volume, expressed as:

Molarity=\frac{number of moles}{volume}

in units of \frac{moles}{liter}

then the number of moles can be calculated as:

number of moles= molarity* volume

You have acid H₂SO₄

  • 35.00 mL= 0.035 L (being 1,000 mL= 1 L)
  • Molarity=  0.737 M

Then:

number of moles= 0.737 M* 0.035 L

number of moles= 0.0258

So you must neutralize 0.0258 moles of H₂SO₄. Now you can apply the following rule of three: if by stoichiometry 1 mole of H₂SO₄ are neutralized with 2 moles of KOH, 0.0258 moles of H₂SO₄ are neutralized with how many moles of KOH?

moles of KOH=\frac{0.0258moles of H_{2} SO_{4}*2 moles of KOH }{1mole of H_{2} SO_{4}}

moles of KOH= 0.0516

Then 0.0516 moles of KOH are needed. So you know:

  • Molarity= 0.827 M
  • number of moles= 0.0516
  • volume=?

Replacing in the definition of molarity:

0.827 M=\frac{0.0516 moles}{volume}

Solving:

volume=\frac{0.0516 moles}{0.827 M}

volume=0.0624 L= 62.4 mL

<u><em>In a titration of 35.00 mL of 0.737 M H₂SO₄, 62.4 mL of a 0.827 M KOH solution is required for neutralization.</em></u>

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2.23 moles of propane react when 294 g of CO₂ is formed .

<h3>What is moles ?</h3>

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In this case you must start balancing the sulfur to have 8 on each side of the reaction. So:

Answer:

Explanation:

The law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.

Then, you must balance the chemical equation. For that, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts.  

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By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.

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Now the amount of elements on each side of the equation:

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