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Evgesh-ka [11]
1 year ago
5

A 1.0 x 102- gram sample is found to be pure alanine, an amino acid found in proteins. How many moles of alanine are in the samp

le
Chemistry
1 answer:
Romashka-Z-Leto [24]1 year ago
4 0

Answer:

1.123x10⁻⁴ moles of alanine

Explanation:

In order to convert grams of alanine into moles, <em>we need to know its molecular weight</em>:

The formula for alanine is C₃H₇NO₂, meaning <u>its molecular weight would be</u>:

  • 12*3 + 7*1 + 14 + 16*2 = 89 g/mol

Then we <u>divide the sample mass by the molecular weight</u>, to do the conversion:

  • 1.0x10⁻² g ÷ 89 g/mol = 1.123x10⁻⁴ moles
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Draw a second resonance structure for the following ion (be sure to include the charges and all lone pairs)... + ..N=N=N &lt;---
joja [24]

Answer:

Explanation:

Resonance structure occurs in an organic compound that undergoes resonance effects. This resonance effect is sometimes called the mesomeric effect helps to increases the stability of organic compounds that have alternating single bonds and double bonds.

The second resonance structure diagram for the ion given in the question can be found in the attached diagram below.

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The chemical formula for cesium oxide is Cs2O. What is the charge of cesium? +1 +2 –1 –2
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2 years ago
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HCN forms when synthetic fibers containing Orlon® or Acrilan® burn. Acrilan® has an empirical formula of CH2CHCN, so HCN is 50.9
hichkok12 [17]

Answer:

676 g

Explanation:

First, let's calculate the area of the rug: 3.70x4.20 = 15.54 m². Knowing that 1 yard has 0.9144 m, so

1 yd² = (0.9144 m)² = 0.8361 m²

So, there is 30.0 oz in 0.8361 m²

30.0 oz-----------------0.8361 m²

x           -----------------15.54 m²

By a simple direct three rule:

0.8361x = 466.2

x = 557.6 oz of Acrilan in the rug

1 oz =  28.35 grams, so 557.6 oz = 15807.96 g

The potencial of HCN is 50.9% of this mass, so: 0.509x15807.96 = 8046.25 g.

But only 42.0% of the rug is burned, so the potencial of HCN is 42.0% of  8046.25: 0.42x 8046.25 = 3379.42 g.

And the yield is only 20.%, so the mass formed of HCN is:

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5 0
2 years ago
Enter the expression 14/7N+α, where α is the lowercase Greek letter alpha. Express your answer as a chemical expression.
Marizza181 [45]

Answer:

<em>¹⁴₇N + ⁴₂He → ¹⁷ ₈O + ¹₁p</em>


Explanation:


¹⁴₇N represents the isotope of nitrogen-14, where the superscript 14 to the left of the chemical symbol of the element  is the mass number (number of protons and neutrons) and the subscripst 7 is the atomic number (number of protons).


α is used to represent alpha particles. Alpha particles are nucleus of helium, ⁴₂He: mass number 4, atomic number 2,

The expression ¹⁴₇N + α represents a nuclear reaction: the nucleus of the isotope of nitrogen-14 (¹⁴₇N) is hit by α-particles ( ⁴₂He).


As result, the nucleus of ¹⁴₇N absorbs 1 proton, increasing its atomic number and mass number in 1, becoming ¹⁷ ₈O. In this process, also one proton is produced.


The total reaction is represented by ¹⁴₇N + ⁴₂He → ¹⁷ ₈O + ¹₁p, where you can verify the mass balance:


Mass numbers: 14 + 4 = 17 + 1 = 18.

Number of protons: 7 + 2 = 8 + 1 = 9.




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2 years ago
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