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Alchen [17]
3 years ago
6

1 webbed feet 2wing structure 3beaks 4 eye color

Chemistry
2 answers:
malfutka [58]3 years ago
7 0
I believe it's webbed feet
antoniya [11.8K]3 years ago
7 0

Explanation:

webbEd feeetttttt ...........

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The <u>Empirical formula</u> gives the smallest whole number ratio of moles of each element in a compound. therefore, multiple compounds may have it in common.

<h3>What is Empirical formula?</h3>

The most straightforward whole number ratio of atoms in a compound is its empirical formula. The empirical formula for sulfur monoxide, or SO, and disulfur dioxide, or S2O2, are both straightforward illustrations of this idea.

<h3>What is multiple compounds?</h3>

According to the law of multiple proportions, if two elements combine to form more than one compound, the ratio of the second element's mass to the fixed mass of the first element will always be a ratio of tiny whole numbers.

<h3>What is empirical formula used for?</h3>

Typically, the empirical formula is used to simply display the components of a molecule. When one needs to quickly identify the elements they are working with, this is helpful. When you want to know how many atoms of each element are present in the molecule, the molecular formula is most helpful.

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A temperature change in a reaction indicates_____.
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A temperature change in a reaction indicates a chemical change

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If 84.1 g of NaOH and 51.0 g of Al and 25.0 g H20 react which chemical is the limiting reactant?
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Answer:

  • <u><em>H₂O</em></u>

Explanation:

<u>1. Chemical quation</u>

The reaction of aluminium, sodium hydroxide and water is represented by the balanced chemical equation:

  • 2Al(s) + 2NaOH(s) + 6H₂O(l) → 2Na[Al(OH)₄] (aq) + 3H₂(g) ↑

The coefficients of each reactant and product give the theoretical mole ratios.

To find the limiting reactant you compare the theoretical ratios with the ratio of the available substaces.

<u>2. Theoretical mole ratio:</u>

  • 2 mol Al : 2 mol NaOH : 6 mol H₂O

Equivalent to

  • 1 mol Al : 1 mol NaOH : 3 mol H₂O

<u>3. Actual ratio</u>

a) Convert each mass to number of moles

Formula:

  • number of moles = mass in grams / molar mass

Al:

  • molar mass = atomic mass = 26.982g/mol
  • number of moles = 51.0g / 26.982g/mol = 1.89 mol

NaOH:

  • molar mass = 39.997g/mol
  • number of moles = 84.1g / 39.997g/mol = 2.10 mol

H₂O:

  • molar mass = 18.015g/mol
  • number of moles = 25.0g / 18.015g/mol = 1.39 mol

Divide all the mole amounts by the least number:

  • Al: 1.89/1.39 = 1.36
  • NaOH: 2.10 = 1.52
  • H₂O: 1.39 = 1.00

  • 1.36 mol Al : 1.52 mol NaOH : 1.00 mol H₂O

<u>4. Comparison</u>

<u />

Theoretical ratio:

  • 1 mol Al : 1 mol NaOH : 3 mol H₂O

Actual ratio:

  • 1.36 mol Al : 1.52 mol NaOH : 1.00 mol H₂O

     Multiply by 3:

  • 4.08 mol Al : 4.56 mol NaOH : 3.00 mol H₂O

Now, yo can see that the first two are in excess with respect the third one, making that the water consumes first, before any of the other two consumes. Therefore, the limiting reactant is the water.

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3 years ago
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