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Volgvan
3 years ago
13

Needed help plzzz on this chemistry homework.

Chemistry
1 answer:
mrs_skeptik [129]3 years ago
5 0
Hertz is units for frequency. (waves per second)
wavelength = speed/frequency

if you're given the speed use that to calculate, if not then you can probably assume it's a wave of light and use the speed of light (3x10^8 m/s) to calculate.

wavelength = (3x10^8)/(1.28x10^17)
= 0.000000002 m
= 2.34 nm

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Answer:

nucleotide is ATG

Explanation:

since it is DNA

8 0
3 years ago
Read 2 more answers
Consider the following reaction: 2 Bi(s) + 3 Cl2(g) → 2 BiCl3(s)
Mandarinka [93]

Taking into account the reaction stoichiometry, 1.119 grams of chlorine gas are required to produce 3.32 grams of bismuth chloride is produced.

<h3>Reaction stoichiometry</h3>

In first place, the balanced reaction is:

2 Bi + 3 Cl₂ → 2 BiCl₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

  • Bi: 2 moles
  • Cl₂: 3 moles
  • BiCl₃: 2 moles

The molar mass of the compounds is:

  • Bi: 209 g/mole
  • Cl₂: 70.90 g/mole
  • BiCl₃: 315.45 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Bi: 2 moles ×209 g/mole=418  g

Cl₂: 3 moles ×70.90 g/mole= 212.7 g

BiCl₃: 2 moles ×315.45 g/mole= 630.9 g

<h3>Mass of Cl₂ required</h3>

The following rule of three can be applied: If by reaction stoichiometry 630.9 grams of BiCl₃ are formed by 212.7 grams of Cl₂, 3.32 grams of BiCl₃ are formed by how much mass of Cl₂?

mass of Cl_{2} =\frac{3.32 grams of BiCl_{3}x212.7 grams of Cl_{2} }{630.9 grams of BiCl_{3}}

<u><em>mass of Cl₂= 1.119 grams</em></u>

Finally, 1.119 grams of chlorine gas are required to produce 3.32 grams of bismuth chloride is produced.

Learn more about the reaction stoichiometry:

<u>brainly.com/question/24741074</u>

<u>brainly.com/question/24653699</u>

5 0
2 years ago
What is the pressure of 5.0 mol nitrogen (N2) gas in a 2.0 L container at 268
CaHeK987 [17]

Answer: 54.94atm

Explanation: Please see attachment for explanation

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3 years ago
Benzoyl peroxide, the substance most widely used against acne, has a half-life of 9.8 × 103 days when refrigerated. How long wil
prohojiy [21]

Answer:

7.3\times 10^2\ days

Explanation:

Given that:

Half life = 9.8\times 10^3 days

t_{1/2}=\frac{\ln2}{k}

Where, k is rate constant

So,  

k=\frac{\ln2}{t_{1/2}}

k=\frac{\ln2}{9.8\times 10^3}\ days^{-1}

The rate constant, k = 0.00007 days⁻¹

Using integrated rate law for first order kinetics as:

[A_t]=[A_0]e^{-kt}

Where,  

[A_t] is the concentration at time t

[A_0] is the initial concentration

Given:

5 % is lost which means that 0.05 of [A_0] is decomposed. So,

\frac {[A_t]}{[A_0]} = 1 - 0.05 = 0.95

t = ?

\frac {[A_t]}{[A_0]}=e^{-k\times t}

0.95=e^{-0.00007\times t}

t = 732.76 days = 7.3\times 10^2\ days

7 0
3 years ago
Which of the following are observations? If a person walks by, then the dog will bark. The candle floats. The tire is flat becau
Softa [21]

Answer:

hello, There!

I'll~ be ~Glad~to~help~you!

<h2>Your Question↓</h2><h3>Which of the following are observations?</h3><h2>Answer↓</h2>

❄ the candle floats, the tires are flat, and the dog is barking are observations.❄

Explanation:

↠ the three given statements are examples of observations, while the last two statements imply the concept of cause-effect relationships. ⬽

Have a great day! ⬽

Therefore, I hope this helps!

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3 years ago
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