a. We first calculate the moles of sucrose needed
moles sucrose = 0.250 M * 0.25 L
moles sucrose = 0.0625 mol
The molar mass of sucrose 342.3 g/mol, so the mass of
sucrose needed is:
mass sucrose = 0.0625 mol * 342.3 g/mol
mass sucrose = 21.4 grams
So simply dissolved about 21.4 grams of sucrose in 250 mL
solution.
b. We use the formula:
M1 V1 = M2 V2
1.50 M * V1 = 0.100 M * 0.350 L
V1 = 0.0233 L = 23.3 mL
So simply take 23.3 mL of solution from 1.50 M then dilute
it with water until 350 mL to make 0.100 M.
There are 20 different type of monomers present in proteins.
Amino acids are in reality the monomers of proteins. Out of the 20 amino acids,
only 9 are considered essential. The other 11 are of little use to the humans.
The nine of the essential amino acids required by humans are Tryptophan,
lysine, Histidine, Isoleucine, Valine, Threonine, Phenylalanine, Methionine and
Leucine. The amino acids combine with one another to form different types of
proteins. These proteins satisfy a number of our physical functional needs.
Energy + SO2(g) -----> S(g) + O2(g) is an edothermic reaction owing to te fact that energy is a reactant in the equation.
<h3>What is an endothermic reaction?</h3>
An endothermic reaction is one in wioch energy is supplied to the system in order to enable the breakdown of bonds. Hence, the reaction vessel feels cool as energy is withdrawn from the surroundings.
The reaction; Energy + SO2(g) -----> S(g) + O2(g) is an edothermic reaction since energy is a reactant in the equation.
Learn more about endothermic reaction: brainly.com/question/10373907
Answer:
HBr + Mg(OH)2 —> MgBr2 + H2O.
To balance the above, we must do a head count of the individual atoms present to ensure they balance on both sides of the equation. To get the balance equation, add 2 in front of HBr and 2 in front of H2O as shown below:
2HBr + Mg(OH)2 —> MgBr2 + 2H2O
We can see clearly that the numbers of the individual atoms on the left side is the same on the right side
