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3 years ago

Can anyone help me on this ques pls, much appreaciated

Chemistry

2 answers:

Bingel [31]3 years ago

8 0

Answer:

letter D po

Explanation:

sana makatulong po Ito

Sloan [31]3 years ago

4 0

Answer:

Option D is Correct answer

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Answer:

The expected value is = 39 units

The standard deviation is = 0.1212 unites

The probability is = 0.2047 units

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4 years ago

The absorbance of a 0.45 mol dm–3 solution of an aromatic amino acid, 3.0 cm thick is 0.22 at a wavelength of 295 nm:

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Explanation:

a) Using Beer-Lambert's law :

Formula used :

$A=\epsilon \times C\times l$

where,

A = absorbance of solution = 0.22

C = concentration of solution = $0.45 mol/dm^3=0.45 mol/L=0.45 M$

$1 dm^3 = 1 L$

l = length of the cell = 3.0 cm

$\epsilon$ = molar absorptivity of this solution = ?

Now put all the given values in the above formula, we get the molar absorptivity of this solution.

$0.22=\epsilon \times (0.45 M)\times (3.0 cm)$

$\epsilon=0.163 M^{-1}cm^{-1}$

Therefore, the molar absorptivity of this solution is, $1.93\times 10^{4}M^{-1}cm^{-1}$

b) $A=\log \frac{I_o}{I_t}$

$T=\frac{I_t}{I_o}$

$A=\log \frac{1}{T}$

A = 2 × 0.22 =0.44

$I_o,I_t$ = Intensities of Incident light and transmitted light respectively

T = Transmittance

$0.44=\log \frac{1}{T}$

T = 0.3630

c) $I_o=x$

$I_t=65\% of x=0.65 x$

Thickness of cell = l' =?

$c = 0.75 mol/ dm^3=0.75 mol/L=0.75 M$

$A=\log \frac{I_o}{I_t}=\epsilon \times C\times l$

$\log \frac{x}{0.65x}=0.163 M^{-1}cm^{-1}\times 0.45 M\times l'$

l' = 1.53 cm

d) No, we cannot calculate the absorbance at 590 nm from the given data. This is because absorbance at this wavelength can be observe experimentally.

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4 years ago

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The intermolecular bonding in the solid is van der Waals dispersion forces. That means that it will have a lower melting point than diamond or graphite where you have giant covalent bonding. In fact C60 sublimes at 800 K (527°C). Diamond and graphite sublime at around 4000 K.

Explanation:

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4 years ago

Sodium (Na) is in Group 1 of the periodic table. Sodium atoms readily form bonds with other atoms. Which statement best explains

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3 years ago

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An example of a homogeneous mixture would be C. A solution.