Answer:
The mole is a key unit in chemistry. The molar mass of a substance, in grams, is numerically equal to one atom’s or molecule’s mass in atomic mass units.
Explanation:
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The amount, in grams, of ethanol needed to prepare 268 grams of a 9.76 M solution of ethanol in water will be 120.50 grams
<h3>Solution preparation</h3>
In order to prepare 268 grams of solution, 268 mL of water would be needed because 1 mL of water weighs 1 gram.
Since we now know the volume of solution that we want to prepare, the amount of solute (ethanol) that would be required in order to make a solution of 9.76 M will be:
Mole required = 9.76 x 268/1000 = 2.62 moles
Mass of 2.62 moles ethanol = 2.62 x 46.07 = 120.50 grams
More on solution preparation can be found here: brainly.com/question/14667249
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Acid-base conjugate pair forms when the element donates a proton and another species acquires it. and are the base-conjugate acid pair.
<h3>What is base-conjugate acid pair?</h3>
Acids are the species or element and compounds that donates proton or hydrogen ions to form a conjugate base.
Bases are the elements or compounds that acquires protons or hydrogen ions and form a conjugate acid pair.
Conjugate acids and bases are the species or the products formed when the protons or hydrogen ions are increased or decreased in their chemical structures.
The reaction can be shown as,
From the reaction, it can be said that the water molecule acquired the hydrogen or the proton ions and the hydronium ion produced as a result is the conjugate acid of the water base.
Therefore, and are the base-conjugate acid pair.
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Group 2A of the Periodic table contains the Alkaline Earth matals. Those elements are: Beryllium ( Be ), Magnesium ( Mg ), Calcium ( Ca ), Strontium ( Sr ), Barium ( Ba ) and Radium ( Ra ). Beryllium is the lightest member of the group 2A. Ionic radius increases moving down the group ans decreases from left to right across the period of elements. In the group 2A ionic radius increases from Beryllium ( 59 pm - picometers ) to Radium ( 163 pm ). Answer: Beryllium<span> has the lowers ionic radius. </span>