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lesya692 [45]
3 years ago
6

20. What volume of 0.350M KMnO4 solution must be diluted to prepare 600. mL of

Chemistry
1 answer:
Dafna1 [17]3 years ago
3 0

Answer:

25.7 mL

Explanation:

Step 1: Given data

  • Initial volume (V₁): ?
  • Initial concentration (C₁): 0.350 M
  • Final volume (V₂): 600 mL
  • Final concentration (C₂): 0.150 M

Step 2: Calculate the volume of the initial solution

We have a concentrated solution and we want to prepare a diluted one. We can calculate the initial volume using the dilution rule.

C₁ × V₁ = C₂ × V₂

V₁ = C₂ × V₂ / C₁

V₁ = 0.150 M × 600 mL / 0.350 M

V₁ = 25.7 mL

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LenaWriter [7]

Answer:

152.4 g of O₂ are consumed.

Explanation:

We start from the combustion reaction:

C₃H₈  +  5O₂  →  3CO₂  +  4H₂O

We convert the mass of propane to moles:

41.9 g . 1mol /44g = 0.952 moles

Ratio is 1:5. 1 mol of propane consumes 5 moles of oxygen at propane combustion

Then, 0.952 moles may consume (0.952 . 5) /1 = 4.76 moles.

We convert moles to mass → 4.76 mol . 32g/mol = 152.4 g

8 0
2 years ago
How many moles of solute are present in .75 l of a .89 m (molar) solution?
never [62]

0.6675 moles of solute are present in .75 l of a .89 m (molar) solution.

<h3>Define the molarity of a solution.</h3>

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution.

Given data:

V= 0.75

M=0.89

Molality = \frac{Moles \;solute}{Volume of solution in litre}

0.89 M=  \frac{Moles \;solute}{0.75 L}

Moles= 0.6675

Hence, 0.6675 moles of solute are present in .75 l of a .89 m (molar) solution.

Learn more about the moles here:

brainly.com/question/24081006

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How many electrons does Br lose or gain to fill its octet?
Greeley [361]

i think it is 8. I might be wrong.

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Ca + HCl -&gt; CaCl2 + H2 Li + H2O -&gt; LiOH + H2 NH3 + O2 -&gt; NO + H2O K + O2 -&gt; K2O
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Answer:

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Explanation:

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Use water as an example to contrast the properties of a compound with the elements from which it is composed
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Properties of a compound is completely different from their elements.

Water is composed by hydrogen and oxygen.

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Another example is when you put a burning wooden splint into oxygen, it burns more brightly. Put it in hydrogen, you may hear a "pop" sound, or even explode when large amount of hydrogen. But if u put a burning splint in water, it goes off.
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