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olasank [31]
3 years ago
10

o álcool isopropílico é um líquido volátil muito utilizado para limpeza de componentes eletrônicos ele é produzido a partir da h

idrogenação de acetona reação química de acetona com hidrogênio gasoso essa reação é representada pela equação química calcule o delta h da reação com base nas informações das energias de ligação das substâncias envolvidas
Chemistry
2 answers:
wlad13 [49]3 years ago
5 0

qual é a equação

________________________________________________________________________________________________________

alexandr402 [8]3 years ago
4 0

Answer: qual é a equação

Explanation:

________________________________________________________________________________________________________

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Can some type 1 paragraph about photosynthesis gas and become my friends and you might get brainlist
Dafna11 [192]

Answer:

Photosynthesis gas, is called carbon dioxide. Carbon Dioxide in this process is where the plants take in the dioxide and water, which is slowly reduced which gains electrons! :)

Explanation:

Hope this helps !  plz mark as brainliest!

7 0
2 years ago
Codeine C18H21NO3 is a weak organic base. A 5.0 x 10^-3 M solution of codeine has a pH of 9.95. Calculate the value of Kb for th
arsen [322]

Answer:

Kb = 4.45\times10^{-7}\ mol/L

p^{Kb}=6.35

Explanation:

For a weak organic base, the formula to find p^{OH} is given by:

p^{OH}=p^{K_b}+\log c

where c is the concentration of base.

Here c= 5\times10^{-3}\ M

p^{H}=9.95\\p^{OH}=14-p^{H}=14-9.95=4.05

Substituting the above values in the formula,we get:

p^{k_b}=p^{OH}-\log c\\p^{k_b}=4.05-\log (5\times10^{-3})\\p^{K_b}=6.35\\K_b=$antilog 6.35=4.45\times10^{-7}\ mol/L

Hence:

Kb = 4.45\times10^{-7}\ mol/L

p^{Kb}=6.35

7 0
2 years ago
Best answer and explanation will get marked brainiest
Darina [25.2K]

The number 345,000 has 3 significant figures because the trailing zeros are not significant since there's no decimal point.

<h3>What is significant figures?</h3>

Significant figures of a number in positional notation are digits in the number that are reliable and necessary to indicate the quantity of something.

Also significant figures can be defined as, the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value.

Examples of significant figures;

  • 405 = 3 significant figures
  • 405000 = 3 significant
  • 0.040500 = 5 significant figures

<u>Note:</u> leading zeros are not significant but trailing zeros, which are zeros at the end of a number, are significant only if the number has a decimal point.

345,000 = 3.45 x 10⁵ (3 significant figures)

Thus, the number 345,000 has 3 significant figures because the trailing zeros are not significant since there's no decimal point.

Learn more about significant figures here: brainly.com/question/24491627

#SPJ1

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1 year ago
How is heat transferred when a person holds an ice pack?
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I’m pretty sure it’s b.
8 0
2 years ago
Equal masses of two substances absorb the same amount of heat. The temperature of a substance A increases twice as much as subst
katrin [286]

Letter A because the temperature of a substance A increases "Twice as much".

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