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2 years ago

6

The blank solution used to calibrate the spectrophotometer is 10.0 mL of 0.2 M Fe(NO3)3 diluted to 25.0 mL with 0.1 M HNO3. Why

is this solution preferred to simply using de-ionized water for the calibration?

1 answer:

Sliva [168]2 years ago

4 0

<span>FeNCS+ product...............thats how you do it i believe </span>

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Calculate the wavelength of the photon that would be absorbed or emitted. Round your answer to 3 significant digits.

Flauer [41]

This is an incomplete question, the image for the given question is attached below.

Answer : The wavelength of photon would be absorbed, $3.06\times 10^{-7}m$

Explanation :

From the given diagram of energy we conclude that,

Energy at ground state, A = 400 zJ

Energy of 2nd excited state, C = 1050 zJ

Now we have to calculate the energy of the photon.

$E=E_c-E_A$

$E=(1050-400)zJ= 650zJ=650\times 10^{-21}J$

Now we have to calculate the wavelength of the photon.

Formula used :

$E=h\times \nu$

As, $\nu=\frac{c}{\lambda}$

So, $E=h\times \frac{c}{\lambda}$

where,

E = energy of photon = $650\times 10^{-21}J$

$\nu$ = frequency of photon

h = Planck's constant = $6.626\times 10^{-34}Js$

$\lambda$ = wavelength of photon = ?

c = speed of light = $3\times 10^8m/s$

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

$650\times 10^{-21}J=(6.626\times 10^{-34}Js)\times \frac{(3\times 10^{8}m/s)}{\lambda}$

$\lambda=3.06\times 10^{-7}m$

Therefore, the wavelength of photon would be absorbed, $3.06\times 10^{-7}m$

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2 years ago

If the concentration of a KCl solution is 16.0% (m/v), then the mass of KCl in 26.0 mL of solution is ________.

melomori [17]

Answer:

The correct answer is 4.16 grams.

Explanation:

Based on the given information, the concentration of KCl solution is 16 % m/v, which means that 100 ml of the solution will contain 16 grams of KCl.

The molarity of the solution can be determined by using the formula,

M = weight/molecular mass × 1000/Volume

The molecular mass of KCl is 74.6 grams per mole.

M = 16/74.6 × 1000/100

M = 16/74.6

M = 2.14 M

Now the weight of KCl present in the solution of 26 ml will be,

2.14 = Wt./74.6 × 1000 /26

Wt. = 4.16 grams

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2 years ago

A car travels a constant speed of 60 Km/h for 3 hours what is the total distance the car has traveled?

ohaa [14]

Answer:

180 miles

Explanation:

60 × 3 = 180

[character limit pass]

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2 years ago

determine the grams of NH3 produced when 6.70 grams of N2 is consumed using the following equation: N2 + 3H2 = 2NH3

tangare [24]

Answer:

Hi im an online tutor and I can help you with your assignments. we have experts in all fields. check out our website for assistance https://toplivewriters.com

Explanation:

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2 years ago

Convert 59,800 cg/L to g/mL

alexgriva [62]

To convert the given value to the desired one, use the proper unit conversions and dimensional analysis. Use the following conversion for the first set.

1 g = 100 cg
1 L = 1000 mL

Using the concept presented above,

V = (59800 cg/L)(1 g/100 cg)1 L/1000 mL)
V = 0.598 g/mL

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3 years ago