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3 years ago

A 250mL sample of air at STP contains approximately 52.5mL of O2. What is the percentage of oxygen in the air

Chemistry

1 answer:

RSB [31]3 years ago

4 0

Yessirrrrrrr wee litttttttt sirrrrr

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The uppermost layer of the atmosphere

Arturiano [62]

The thermosphere is.

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3 years ago

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What is the mole fraction of NaCl in a mixture containing 7.21 moles NaCl, 9.37 moles KCL, and 3.42

GrogVix [38]

Answer : The mole fraction of NaCl in a mixture is, 0.360

Explanation : Given,

Moles of $NaCl$ = 7.21 mole

Moles of $KCl$ = 9.37 mole

Moles of $LiCl$ = 3.42 mole

Now we have to calculate the mole fraction of $NaCl$ .

$\text{Mole fraction of }NaCl=\frac{\text{Moles of }NaCl}{\text{Moles of }NaCl+\text{Moles of }KCl+\text{Moles of }LiCl}$

Now put all the given values in this formula, we get:

$\text{Mole fraction of }NaCl=\frac{7.21}{7.21+9.37+3.42}=0.360$

Therefore, the mole fraction of NaCl in a mixture is, 0.360

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3 years ago

175 mL of a 1.6 M solution of KCl is diluted to a new volume of 1.0 L. What is the new concentration of the solution?

kupik [55]

Answer:

b. .28 M KCI

Explanation:

Use the dilution formula.

C₁V₁ = C₂V₂

C₂ = C₁V₁/V₂

C₂ = 1.6*0.175 / 1.0

C₂ = 0.28

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2 years ago

Which instrument is most often used to measure acid volume before a titration begins?

Darya [45]

<span>Good Morning!

To measure the volume of an acid we use in the laboratory an instrument called burette (a). This instrument is used to calculate the volumes of chemical solutions. At first glance, these tools may be confused with syringes, but have different functions.

Hugs!</span>

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4 years ago

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What is the correct formula for Tin (IV) chromate nonahydrate?

Mashcka [7]

Answer:

Sn(CrO4)2 or Cr2O8Sn

Explanation:

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3 years ago