The number of moles in 2.154 x 10⁻¹ kg of Al is 7.984.
<h3>What is a Mole?</h3>
- A mole is a unit used to describe the amount of substance that has exactly the same number of elementary particles as there are atoms in 12 grams of Carbon - 12.
- A mole has 6.022 x 10²³ elementary particles (atoms, ions or molecules, etc.). This fixed quantity is known as Avagadro's Number.
The molar mass of Al = 26.98 gmol⁻¹
Given the mass of Al = 2.154 x 10⁻¹ kg = 215.4 g
Number of moles given by
where m = given mass of the compound
M = Molar mass of the compound
The number of moles of Al = = 7.984 moles
Hence, the number of moles of Al is 7.984 moles.
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The noble gas notation of an element includes a noble gas as a condensed way to describe the electronic configuration of an element. IN this case, the nearest noble gas is xenon with an atomic number of 54. Hg's atomic number is 80 so we need 26 more. In this case, after [Xe], the configuration starts with 6s². Hence to complete the configuration the answer is [Xe] 6s2 4f14 5d10
The two
Esters along with starting materials are shown below. The missing reagents ate shown in Blue encircled in red box. First reaction is carried out in acid which increases the reactivity of carboxylic acid (
electrophilicity odf carbonyl carbon). And second reaction is carried out in the presence of Base, which increases the
Nucleophilicity of nucleophile i.e. Alcohols.
Answer:
The answer to your question is a) Covalent b) Ionic
Explanation:
Data
Kind of bond between C - C
kind of bond between Mg -Cl
Process
1.- Look for the electronegativities of these elements
Carbon electronegativity = 2.55
Magnesium electronegativity = 1.31
Chlorine electronegativity = 3.16
2.- Calculate the difference of electronegativities
a) C - C = 2.55 - 2.55 = 0
b) Mg - Cl = 3.16 - 1.31 = 1.85
3.- Kind of bond
a) It's covalent because the difference of electronegativity was lower than
1.5.
b) It's ionic because the difference of electronegativity was higher than 1.5.
Answer:
The term "three-dimensional learning" refers to the three pillars that support each standard, now called "performance expectations." These three dimensions are: Science and Engineering Practices, Crosscutting Concepts, and Disciplinary Core Ideas. You can use this rubric to evaluate your own curriculum for NGSS.
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