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Zanzabum
3 years ago
13

Watch the video that shows using the dilution method to make a solution of known concentration. Note that while the video shows

the use of a beaker, in the lab we typically use a volumetric flask to make the diluted solution. The stock solution of KMnO4 has a concentration of 2.6 × 10-4 M. The pipette has a volume of 10.0 mL. What is the amount of KMnO4 delivered to the solution, in moles
Chemistry
1 answer:
Nady [450]3 years ago
4 0

Answer:

2.6\times 10^{-6}\ moles

Explanation:

Considering:

Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}

Or,

Moles =Molarity \times {Volume\ of\ the\ solution}

Given :

For potassium permanganate :

Molarity = 2.6\times 10^{-4}\ M

Volume = 10.0 mL

The conversion of mL to L is shown below:

1 mL = 10⁻³ L

Thus, volume = 10.0×10⁻³ L

Thus, moles of potassium sulfate :

Moles=2.6\times 10^{-4} \times {10.0\times 10^{-3}}\ moles

Moles of potassium permanganate = 2.6\times 10^{-6}\ moles

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How many joules of heat are lost when 150.0 g of steam are cooled from 124. C to 86 C?
Alinara [238K]

 The  amount   of  joules  of heat  that are lost when 150.0 g of steam  are cooled  from 124 °c to 86 °c  is = -11343  joules


 calculation

heat(Q) = mass(m) x specific heat capacity(C) x  change  in temperature     (ΔT)

  where,

Q=? joules

M=150.0 g

C for steam = 1.99 j/g/°c

ΔT= 86°c-124°c = -38°c


Q  is therefore = 150.0 g x  1.99 j/g/°c   x -38°c =-11343 joules


6 0
3 years ago
What is the common uses of bases
ratelena [41]
To neutralize acids.
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2 years ago
A solution is created by dissolving 11.5 grams of ammonium chloride in enough water to make 255 mL of solution. How many moles o
Nata [24]

Answer:

<h2>The no. of moles present in one liter solution is 0.843</h2>

Explanation:

Mass of ammonium chloride  = 11.5 gm

Molar mass  of ammonium chloride  = 53.491 gm

No. of moles

N = \frac{mass}{molar \ mass}

N = \frac{11.5}{53.491}

N = 0.215 moles

Molarity=  \frac{N}{volume}

molarity = \frac{0.215}{0.255}

M = 0.843 M

Thus the no. of moles present in one liter solution is 0.843

3 0
4 years ago
How can a scientist ensure that his or her data are reliable? by making a single observation
alekssr [168]
Having accurate  Specific date can give scientist what they need for more reliabliltiy.
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3 years ago
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Which statement is true about the ionic size of the elements in a group as one moves from top to bottom in that group?
nekit [7.7K]

Answer:

Ionic size increases from top to bottom within the group.

Explanation:

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  • The ionic radius is the distance from the nucleus of an ion to the outermost energy level.
  • The ionic size or radius increases down the group as the number of energy level increases.
  • Therefore, an ion of an element lower in the group will be larger than the ion of an element higher in the group.
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8 0
3 years ago
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