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max2010maxim [7]
3 years ago
11

Students in chemistry class have been given the assignment to use flame test emission data to determine the identity of an

Chemistry
1 answer:
konstantin123 [22]3 years ago
6 0

It is impossible to narrow down anything about the unknown.

Flame tests are common analytical techniques used to determine the composition of an unknown compound based on the color that it imparts to flame. Each metal ion imparts a specific color to flame which helps us to identify it.

In this case, two colors were visible in the flame and it will be difficult to determine which of the colors corresponds to the actual metal ion present.

Therefore, it is impossible to narrow down anything about the unknown.

Learn more: brainly.com/question/6357832

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Why is graphite used instead of gold or copper wires to conduct electricity in very hot situations such as an industrial kiln?
olga2289 [7]
<span>The strong bonds give graphite high boiling and melting points, while the weak bonds make graphite soft and flexible.</span>
5 0
2 years ago
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When 125 grams of FeO react with 25.0 grams of Al, how many grams of Fe can be produced? FeO + Al → Fe + Al2O3 25.9 g Fe 38.7 g
Serga [27]

<u>Answer:</u> The mass of iron produced will be 77.6 grams

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}     .....(1)

  • <u>For FeO:</u>

Given mass of FeO = 125 g

Molar mass of FeO = 71.8 g/mol

Putting values in equation 1, we get:

\text{Moles of FeO}=\frac{125g}{71.8g/mol}=1.74mol

  • <u>For aluminium:</u>

Given mass of aluminium = 25.0 g

Molar mass of aluminium = 27 g/mol

Putting values in equation 1, we get:

\text{Moles of aluminium}=\frac{25.0g}{27g/mol}=0.93mol

The given chemical reaction follows:

3FeO+2Al\rightarrow 3Fe+Al_2O_3

By Stoichiometry of the reaction:

2 moles of aluminium metal reacts with 3 mole of FeO

So, 0.93 moles of aluminium metal will react with = \frac{3}{2}\times 0.93=1.395mol of FeO

As, given amount of FeO is more than the required amount. So, it is considered as an excess reagent.

Thus, aluminium metal is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

2 moles of aluminium metal produces 3 mole of iron metal

So, 0.93 moles of aluminium metal will produce = \frac{3}{2}\times 0.93=1.395moles of iron metal

  • Now, calculating the mass of iron metal from equation 1, we get:

Molar mass of iron = 55.85 g/mol

Moles of iron = 1.395 moles

Putting values in equation 1, we get:

1.395mol=\frac{\text{Mass of iron}}{55.85g/mol}\\\\\text{Mass of iron}=(1.395mol\times 55.85g/mol)=77.6g

Hence, the mass of iron produced will be 77.6 grams

4 0
3 years ago
What is the mass percent of potassium sulfate in solution if 78g of potassium sulfate is dissolved in 500 mL of water? (The dens
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Answer:

13.5 %

Explanation:

First we<u> calculate the mass of 500 mL of water</u>, using <em>its density</em>:

  • Volume * Density = Mass
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Then we <u>calculate the mass percent of potassium sulfate</u>, using the formula:

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2 years ago
Which of the following BEST describes a process by which metamorphic rock becomes igneous rock?
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Answer:

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Description of Phase Change Term for Phase Change Heat Movement During Phase Change

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