You are making homemade ice cream and can use either 200 g Ice Melt (CaCl2) or 200 g rock salt (NaCl) to lower the freezing poin
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Answer : The theoretical yield of water formed from the reaction is 0.54 grams.
Solution : Given,
Mass of HCl = 1.1 g
Mass of NaOH = 2.1 g
Molar mass of HCl = 36.5 g/mole
Molar mass of NaOH = 40 g/mole
Molar mass of = 18 g/mole
First we have to calculate the moles of HCl and NaOH.
Now we have to calculate the limiting and excess reagent.
The balanced chemical reaction is,
From the balanced reaction we conclude that
As, 1 mole of HCl react with 1 mole of NaOH
So, 0.030 mole of HCl react with 0.030 mole of NaOH
From this we conclude that, is an excess reagent because the given moles are greater than the required moles and
is a limiting reagent and it limits the formation of product.
Now we have to calculate the moles of
From the reaction, we conclude that
As, 1 mole of react to give 1 mole of
So, 0.030 moles of react to give 0.030 moles of
Now we have to calculate the mass of
Therefore, the theoretical yield of water formed from the reaction is 0.54 grams.
The structure of this oligopeptide is attached:
It consists of arginine - alanine - phenylalanine and leucine
From the picture we can see that N terminus charge is +1
Also Arginine is considered as basic amino acid with charge +1
C terminus charge is -1
At pH = 8, the whose pKa are less than pH will be deprotonated and the net charge will be +1
So the net charge of this oligopeptide is +1 at pH = 8
It consists of arginine - alanine - phenylalanine and leucine
From the picture we can see that N terminus charge is +1
Also Arginine is considered as basic amino acid with charge +1
C terminus charge is -1
At pH = 8, the whose pKa are less than pH will be deprotonated and the net charge will be +1
So the net charge of this oligopeptide is +1 at pH = 8