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Novay_Z [31]
3 years ago
9

HURRY PLEASE HELP!!

Chemistry
1 answer:
navik [9.2K]3 years ago
7 0

Answer:

Option D. 2. 19. 12. 14.

Explanation:

Look at the oxygens, which can be disbalanced. The other chioices does not balance the atoms so if we take account the last option we see that we have 38 atoms of O. 14 from water and 24 from CO2, so in reactant side it is logical to have 19 moles of O2 (the dyatomic molecule). In order to follow with C and H, we have 28 H and 12 C in both sides.

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Answer:

Is this chemistry or ELA!

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3 years ago
6) (a) Calculate the absorbance of the solution if its concentration is 0.0278 M and its molar extinction coefficient is 35.9 L/
Anvisha [2.4K]

Answer:

6) (a) 0.499; (b) 31.7 %

7) 0.15

Explanation:

6) (a) Absorbance

Beer's Law is

A = \epsilon cl\\A = \text{35.9 L&\cdot$mol$^{-1}$cm$^{-1}$} $\times$ 0.0278 mol$\cdot$L$^{-1} \times $ 0.5 cm = \mathbf{0.499}

(b) Percent transmission

A = \log {\left (\dfrac{1}{T}}\right)}\\\\\%T = 100T\\\\T = \dfrac{\%T}{100}\\\\\dfrac{1}{T} = \dfrac{100 }{\%T}\\\\A = \log \left(\dfrac{100 }{\%T} \right ) = 2 - \log \%T\\\\0.499 = 2 - \log \%T\\\\\log \%T = 2 - 0.499 = 1.501\\\\\%T = 10^{1.501} = \mathbf{31.7}

7) Absorbance

A = \log \left (\dfrac{I_{0}}{I} \right ) = \log \left (\dfrac{I_{0}}{0.70I_{0}} \right ) = \log \left (\dfrac{1}{0.70} \right ) = -\log(0.70) = \mathbf{0.15}}

8 0
3 years ago
What types of metals require the use of a Roman numeral in the name of their iconic compounds
denis23 [38]
The answer is transition metals because they have no specific charge except for 1 or 2 of them
3 0
3 years ago
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A solid that forms and separates from a liquid mixture is a.......
inna [77]

A solid that forms and separates from a liquid mixture is a chemical change.

4 0
4 years ago
Which of the reactions below are catalyzed? Check all that apply.
Verdich [7]

Answer:

B. Salt, NaCl, is produced by the process of evaporation of seawater or brine. If the surface area of the water is increased, the same volume of water evaporates faster.

C. The Haber process combines hydrogen and nitrogen to make ammonia. The two gases are passed through a reactor under pressure and at high temperatures. If iron is added to the reactor, the yield of ammonia increases.

Explanation:

Evaporation of water is responsible for the production of sodium chloride also known as table salt. Sodium and chlorine are present in water. When more evaporation of water occurs, sodium and chlorine come close together forming sodium chloride. Haber process is responsible for the production of ammonia which is used as fertilizer. For speed up the process, catalyst is used such as iron in order to complete the reaction in less time. Iron binds hydrogen and nitrogen with each other.

7 0
3 years ago
Read 2 more answers
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