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maw [93]
3 years ago
5

PLEASE HELP WILL MARK BRAINLIEST

Chemistry
2 answers:
Lelechka [254]3 years ago
7 0

Answer:

The answer is

Explanation:

Definitions

Observation: is when something catches our attention

Prediction: is a statement about a future event, based upon experience and knowledge

Inference: is a conclusion based on evidence and reasoning.

Hypothesis: is a proposed explanation for a fenomenon

Case I:

It isn't an observation

It isn't a prediction because it happened not will happen

I think is an inference

It isn't a hypothesis, a hypothesis has an specific structure If ... then ...

Case II

I think is a prediction, something that will happen

It isn't an observation he did more than that

It isn't an  inference

Hypothesis has an structure.

MAXImum [283]3 years ago
4 0

Answer:

1 is b and 2 is d

Explanation:

because you do not know that the cat had done that you was just thinking it was the cat

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Chlorine is used to make bleach solutions containing 5.25% NaClO (by mass). Assuming 100% yield in the reaction producing NaClO
Archy [21]

To make 1000. L of bleach solution 1.69×10⁴ L of Cl₂(g) at STP will be needed .

<h3>What is Balanced chemical equation?</h3>

A balance chemical equation is an equation that contain same number of atoms as well as of each element on each side of reaction.

<h3>What is Density?</h3>

It is ratio of mass to the volume.

Density= \frac{Mass}{Volume}

Now,

   The balanced chemical equation of preparing bleach from chlorine is as follow:

Cl₂(g) + 2NaOH(aq) → NaClO(aq) + NaCl(aq) + H₂O(l)

Now,

  To calculate the Moles of NaClO in 1000L solution, first calculate it's mass.

Mass of NaClO = Density × Volume

                         =  1.07\frac{g}{ml} × 1000L × \frac{1000mL}{1L} ×\frac{5.25}{100}

                         = 56175g

Now, we have to calculate moles of NaClO

Hence,

  Moles of NaClO = \frac{amount of NaClO}{molar mass of NaClO}

                              =  \frac{56175g}{74.44\frac{g}{mol} }

                              = 754.63 mol

Now,

According to the reaction number of moles of Cl₂ is equal to the number of moles of NaClO.

Hence,

  moles of Cl₂ = 754.63 mol

Now , in order to calculate litres of Cl₂ at STP,

 We know that

 1 mol Cl₂ = 22.4 L of Cl₂

 754.63 mol of Cl₂ = 754.63 mol × 22.4 L

                               =   1.69×10⁴ L of Cl₂

Thus from the above conclusion we can say that , to make 1000. L of bleach solution 1.69×10⁴ L of Cl₂(g) at STP will be needed .

Learn more about Balanced Chemical Equation here:brainly.com/question/27135494

#SPJ4

       

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