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kotegsom [21]
3 years ago
12

There are four stations in the laboratory in which students are measuring the densities of different objects. Data for each obje

ct is given below. Which station contains the object with the largest density?
Station 1:
Irregularly-shaped object
Mass = 0.025 kg
Volume: Raised the volume of water from 12.6 mL to 17.8 mL in a graduated cylinder.

Station 2:
Rectangular block
Mass = 7.65 g
Length = 0.98 cm
Width = 1.01 cm
Height = 1.43 cm

Station 3:
Cube
Mass = 5.12 g
Displaces 18 mL of fluid in a graduated cylinder

Station 4:
Unknown shape, mass and volume. It does float when put into water.

A) station 1
B) station 2
C) station 3
D) station 4
Chemistry
1 answer:
lidiya [134]3 years ago
3 0

Answer:

B) station 2

Explanation: I did the usatestprep:)

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Th e molar absorption coeffi cient of a substance dissolved in water is known to be 855 dm3 mol−1 cm−1 at 270 nm. To determine t
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Answer : The percentage reduction in intensity is 79.80 %

Explanation :

Using Beer-Lambert's law :

A=\epsilon \times C\times l

A=\log \frac{I_o}{I}

\log \frac{I_o}{I}=\epsilon \times C\times l

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I_o = incident light

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

\log \frac{I_o}{I}=(855dm^3mol^{-1}cm^{-1})\times (3.25\times 10^{-3}mol.dm^{-3})\times (0.25cm)

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Here 'I' intensity of transmitted light = 20.198

Thus, the intensity of absorbed light I_A = 100 - 20.198 = 79.80

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\% \text{reduction in intensity}=\frac{79.80}{100}\times 100=79.80\%

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