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Lina20 [59]
3 years ago
6

How many iron atoms would be produced by 4.5g of Fe2O3 reacting eith an excess of magnesium

Chemistry
2 answers:
tatiyna3 years ago
6 0
Hope this helps you.

ankoles [38]3 years ago
5 0

Answer :  0.34\times 10^{23}atoms

Explanation : Given,

Mass of Fe_2O_3 = 4.5 g

Molar mass of Fe_2O_3 = 159.69 g/mole

Molar mass of Fe = 56 g/mole

First we have to calculate the moles of Fe_2O_3.

\text{Moles of }Fe_2O_3=\frac{\text{Mass of }Fe_2O_3}{\text{Molar mass of }Fe_2O_3}=\frac{4.5g}{159.69g/mole}=0.028moles

Now we have to calculate the moles of Fe.

The balanced chemical reaction will be,

Fe_2O_3+3Mg\rightarrow 2Fe+3MgO

From the balanced reaction we conclude that

As, 1 moles of Fe_2O_3 react to give 2 moles of Fe

So, 0.028 moles of Fe_2O_3 react with \frac{2}{1}\times 0.028=0.056 moles of Fe

Now we have to calculate the mass of Fe.

\text{Atoms of}Fe=\text{Moles of }Fe\times \text{Avogadro's Number}

\text{Atoms of}Fe=(0.056mole)\times (6.023\times 10^{23})=0.34\times 10^{23}atoms

Therefore, the number of atoms will be 0.34\times 10^{23}atoms

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6) A volume of 473 mL of oxygen was collected at 27°C. What volume would the oxygen occupy at
sertanlavr [38]

Answer : The volume of oxygen occupy at 173° would be, 703.2 mL

Explanation :

Charles' Law : It states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

\frac{V_1}{T_1}=\frac{V_2}{T_2}

where,

V_1\text{ and }T_1 are the initial volume and temperature of the gas.

V_2\text{ and }T_2 are the final volume and temperature of the gas.

We are given:

V_1=473mL\\T_1=27^oC=(27+273)K=300K\\V_2=?\\T_2=173^oC=(173+273)K=446K

Now put all the given values in above equation, we get:

\frac{473mL}{300K}=\frac{V_2}{446K}\\\\V_2=703.2mL

Therefore, the volume of oxygen occupy at 173° would be, 703.2 mL

6 0
2 years ago
What is the type of mutation represented by the amino acid sequence below?
Ilia_Sergeevich [38]

Answer:

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Explanation:

A substitution mutation is a type of mutation in which one or more nucleotide base is replaced by another in a sequence. This will result in the replacement of one or more amino acid in the amino acid sequence.

This is the case in this question where the original amino acid sequence was given as: Leucine – Alanine – Glycine – Leucine. After mutation, the following mutated sequence was produced: Leucine – Alanine – Valine – Leucine.

As illustrated above, one would notice that there is replacement of GLYCINE amino acid by VALINE in the mutated sequence, hence, it is an example of SUBSTITUTION MUTATION.

6 0
3 years ago
Please help... I am begging...
iVinArrow [24]

Answer:

The number, such as 98.7 FM, of a radio station represents:

  • <u>the frequency in which is transmitted the radio signal</u>.

Explanation:

<em>The radio FM is the modulated frequency, which means that all the information is sent by just a signal, with different frequencies which difference them</em>, <u>the radio FM use the frequencies from 88 MHz until 108 Mhz (MHz is a measuring unit for the frequency), with a minimal space among them of 0.2 MHz</u>, this last means that you could find a signal in 88.0 MHz, and the next should be 88.2 MHz, next 88.4 MHz and so (at least, regularly the space between two frequencies is more than 0.2 MHz).

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Answer:

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Explanation:

8 0
2 years ago
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