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3 years ago

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cuantos gramos de oxígeno necesarios para que reaccionen completamente 28 gramos de etanol (c2h5oh) en la reaccion de combustion

de este compuesto

1 answer:

tigry1 [53]3 years ago

4 0

Answer:

I dont speak this language sorry :(

Explanation:

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What is the term for secondary consumers in an ecosystem?

borishaifa [10]

Answer: Carnivores, or Meat Eaters

Reason/Explanation:
Another name for Secondary Consumers is Carnivores. They eat flesh, and meat. They feed on the herbivores. An example of this is snakes, squirrels, ravens, etc. They eat plants and meat.

-DustinBR

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3 years ago

The hydrogen ion concentration is 1 × 10-7. What is the ph of this solution?

Naya [18.7K]

Answer:

<em>The pH of the solution is </em><u><em>7</em></u>

Explanation:

<em>The pH</em> is a measure of the acidity of the solutions. It is defined as the negative logarithm of the molar concentration of hydrogen ions (H⁺).

pH = - log [H⁺]

<em>The hydrogen ion concentration of this solution is 1 × 10⁻⁷ M.</em>

Hence:

pH = - log (1 × 10⁻⁷) = - (-7) = 7

This pH corresponds to a neutral solution (neither acid nor alkaline).

You should remember this relation bwtween pH and acidity/alkaliinity:

Low pH (0.0 or close) corresponds to strong acids
HIgh pH (14.0 or close) corresponds to strong bases
Acids have pH between 0.0 and 7.0
Bases have pH between 7.0 and 14.0

6 0

3 years ago

When 33 g of CaO and 10 g of H2O react, how many grams of calcium hydroxide would you expect to be produced* Explain your answer

MrMuchimi

Answer:

41.44 g

Explanation:

First of all, we must put down the equation of the reaction;

$CaO + H2O ----->Ca(OH)2$

Number of moles of CaO = 33g/56 g/mol = 0.59 moles

Number of moles of H20 = 10g/18 g/mol = 0.56 moles

Since the reaction is in 1:1 mole ration, H2O is the limiting reactant

Hence;

mass of Ca(OH)2 produced = 0.56 moles * 74 g/mol = 41.44 g

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3 years ago

Read 2 more answers

How was the modern understanding of the atom developed?

Zepler [3.9K]

Answer:

The modern understanding of an atom was developed by the quantum theory

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3 years ago

Radioactive decay can be described by the following equation where is the original amount of the substance, is the amount of the

soldi70 [24.7K]

Answer:

Iron remains = 17.49 mg

Explanation:

Half life of iron -55 = 2.737 years (Source)

$t_{1/2}=\frac {ln\ 2}{k}$

Where, k is rate constant

So,

$k=\frac {ln\ 2}{t_{1/2}}$

$k=\frac {ln\ 2}{2.737}\ year^{-1}$

The rate constant, k = 0.2533 year⁻¹

Time = 2.41 years

$[A_0]$ = 32.2 mg

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

So,

$[A_t]=32.2\times e^{-0.2533\times 2.41}\ mg$

$[A_t]=32.2\times e^{-0.610453}\ mg$

$[A_t]=17.49\ mg$

<u>Iron remains = 17.49 mg</u>

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3 years ago