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pantera1 [17]
3 years ago
7

We have a solution of C5H10O2 of concentration 4 M. Find out the volume we need to take from this solution to make a 250 mL solu

tion of concentration 0.5 M.
Is my result right? I got 31.25 mL

Here's what I did:
M=moles solute / volume (L) solution (M=n/V)
First I calculate the moles of acid needed for a 0.5M, 0.25L solution.
n=M*V = 0.5*0.25 = 0.125 mol acid
Now knowing how many moles I need to take, I calculate the volume those moles occupy in the 4M solution.
V=n/M = 0.125/4 = 0.03125 L solution = 31.25 mL
So you need to take 31.25 mL of 4M acid solution and add 218.75 (250*31.25) of water to make a 0.5M, 250 mL solution.
Chemistry
1 answer:
dalvyx [7]3 years ago
7 0
You are right.

Here's an easier way to do it : 
We have an initial solution of concentration C.
We want to turn it into a V mL solution of concentration C_1, and we want to know which volume V_1 of solution to take from the original to do that.
We know that C_1=C\frac{V_1}V hence V_1=\frac{C_1}CV=\frac{0.5}4250=\frac{250}8=31.25 mL
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coldgirl [10]

Copper substance cannot be decomposed by a chemical change.

<h3 />
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  • Elements are those pure compounds that cannot be broken down by reactions, heating, electrolysis, or other common chemical processes. Examples of elements are oxygen, gold, and silver. Its makeup stays the same, though.  One instance of a physical change is melting.  A physical change is when a sample of matter experiences a change in some of its qualities but not in its identity. Water turns into water vapour when it is heated.

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In 1838, botanist Matthias Schleiden, determined that all plants are composed of cells. In 1839, anatomist Theodor Schwann propo
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Answer:

This question is incomplete; the complete part is:

A) All cell have a cell wall.

B) All cell arise from pre-existing cells.

C) All cell are capable of photosynthesis.

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The answer is B

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The commonly known universal theory proposed in 1838 took the contribution from three remarkable scientists namely: botanist Matthias Schleiden, anatomist Theodor Schwann and biologist Rudolph Virchow. According to the question, Mathias discovered that all plants are made of cells, Schwann determined that all animals are made of cells while Virchow determined that all living things are composed of cells.

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6 0
3 years ago
A plate moves 200 m in 10,000 years. What is its rate in cm/year?
Varvara68 [4.7K]

Answer:

The answer is

<h2>2 cm/year</h2>

Explanation:

To find the rate in cm/year we must first convert 200 m into cm

1 m = 100 cm

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