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lubasha [3.4K]
3 years ago
11

HELP ASAP ITS TIMED!!!

Chemistry
2 answers:
Tpy6a [65]3 years ago
5 0

Answer:

C would be the right answer

IgorLugansk [536]3 years ago
3 0

Answer:

B

Explanation:

I have a similar question and it was correct try B

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True of false metals like copper are sometimes used to fill cavities in teeth
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A stock phenolphthalein solution was prepared by dissolving 0.050 g in a total volume of 100.0 ml. You place one drop (0.050 ml)
devlian [24]

Answer:

the value of molar absorptivity is 229000 M^{-1} cm^{-1}

Explanation:

given data

phenol phthalein solution = 0.050 g

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diluted sample = 0.18

solution

we get here concentration that is express as

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put here value

concentration = \frac{0.050\times 1000}{318.32\times 100}    

concentration = 0.00157 M

and here dillution equation is express as

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here c1 and c2 is initial and final concentration

and v1 and v2 is initial and final volume

put here value  

0.001571 × 0.050 = c2 × 100

c2 = 7.855 × 10^{-7} M

and

now we get molar by absorbance equation that is

A = E × C ×  l   ................3

here A is absorbance and E is molar and c is absorptivity and l is path length

put here value

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What is the smallest part of all matter
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