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Luda [366]
3 years ago
15

Ethanol is used widely as a solvent in laboratories for various chemical reactions. A laboratory technician takes 50.0 mL of eth

anol and dilutes it to 100.0 mL with distilled water. What is the percentage concentration by volume of the resulting solution?
Chemistry
2 answers:
puteri [66]3 years ago
8 0
This question is quite vague, as the initial concentration of ethanol is not provided. However, from experience I can tell you that most laboratory work is done with 98% ethanol, and not absolute ethanol (100%). So in order to calculate the final concentration, we need to take the given values, which includes the initial concentration (98%), the initial volume (50.0mL) and the final volume (100.0mL). We apply the following equation to calculate the final concentration:

C1V1 = C2V2
C1 = Initial concentration
C2 = Final concentration
V1 = Initial volume
V2 = Final volume

(98%)(50.0mL) = (C2)(100.0mL)
Therefore, the final concentration (C2) = 49%
borishaifa [10]3 years ago
8 0
The answer is B 50% just finished the test
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How many grams of NaOH are in a 225.0 mL sample of a 2.5 M solution of NaOH? (Molar mass of NaOH is 40.0 g/mol)
ladessa [460]

Answer

Approx. 4 g of NaOH.

Explanation:

Concentration

 

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0.250

⋅

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0.400

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o

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0.100

⋅

m

o

l

×

40.0

⋅

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⋅

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Explanation:

6 0
3 years ago
A scientist is studying the effect of climate change on a population of fur seals living on an island off the coast of Alaska. F
solniwko [45]

Answer:

A

Explanation:

The only factor that would not decrease the carrying capacity of the fur seal's environment is the population of predators.

<em>The carrying capacity is defined as the maximum number of individuals of a species an environment can sustain based on the resources available. Hence,   only a fluctuation in the resources available in the environment of the fur seal can affect the carrying capacity. </em>

<u>Pollution </u>and <u>destruction of the habitat of the fur seal</u> would limit the resources available to the animals and as such, limit the carrying capacity. A <u>fluctuation in the population of prey available</u> for the population of fur seals would also affect the carrying capacity.

The only factor that has no bearing on the carrying capacity of the fur seal's environment is the population of predators. Predators have the capacity to reduce the population of fur seals but not affect the carrying capacity for fur seals.

The correct option is, therefore, A.

3 0
3 years ago
30.5 g of sodium metal reacts with chlorine gas to produce sodium chloride. How much (in grams) chlorine gas must react with thi
Lena [83]

Answer:

Mass of chlorine = 47.22 g

Explanation:

Given data:

Mass of sodium = 30.5 g

Mass of chlorine= ?

Solution:

Chemical equation:

 2Na + Cl₂      →      2NaCl  

Number of moles of Na:

Number of moles = mass/molar mass

Number of moles = 30.5g/ 23 g/mol

Number of moles = 1.33 mol

Now we will compare the moles of Cl ₂ with Na from balance chemical equation.

                    Na            :              Cl ₂

                     2              :               1

                     1.33          :            1/2×1.33 = 0.665 mol

Mass of chlorine gas:

Mass = number of moles × molar mass

Mass = 0.665 mol × 71 g/mol

Mass = 47.22 g

6 0
3 years ago
What happens when a piston is used to decrease the volume of a contained gas? a. Fewer gas particles exert a force on the piston
Lostsunrise [7]

Answer:

I think it explodes

Explanation:

4 0
4 years ago
What is electrophoresis​
RUDIKE [14]

Answer:

electrophoresis is the movement of charged particles in a fluid (or it could also be a gel) under the control of a electric field

7 0
3 years ago
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