Answer:
The correct response is "9.313 M".
Explanation:
According to the question, the values are:
Moles of solute,
= 0.57 moles
Liters of solution,
= 61.2 mL
or,
= 0.0612 L
Now,
The molarity will be:
= 
On putting the given the values in the above formula, we get
= 
= 
Answer: The empirical formula is 
Explanation:
If percentage are given then we are taking total mass is 100 grams.
So, the mass of each element is equal to the percentage given.
Mass of Ca= 55.6 g
Mass of S = 44.4 g
Step 1 : convert given masses into moles.
Moles of Ca =
Moles of S =
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For Ca = 
For S =
The ratio of Ca : S = 1:1
Hence the empirical formula is
Answer: -
The first step involves protonation of the carbonyl oxygen.
After protonation, the Alcohol oxygen now attacks the carbon of the carbonyl.
Thus a six membered ring is formed with 5 carbon atoms and 1 oxygen atom. The 1st position carbon atom has 2 OH groups.
One of these gets again protonated.
This leaves as water. With the loss of the H+, there results a carbonyl at 1 position.
Thus 5-hydroxypentanoic acid forms a lactone or 2-oxanone in presence of acid.
Answer:
The law of definite proportions states that all pure samples of a particular chemical compound contain similar elements combined in the same proportion by mass.
The second law of chemical combination which is supported by the Atomic theory was proposed by Proust (1755-1826). Known as the Law of Definite Proportions or Constant Composition ,it is based on the fact that when elements combine to form a given compound , they do so in fixed proportions by mass so that all pure samples of that compound are identical in composition by mass.
Consider water for example . Chemical analyses showed that as long as it is pure, its composition is always in the ratio of one mole of oxygen molecules (i.e 32 g) to two moles of hydrogen molecules (i.e 4g) , irrespective of whether the water comes from the river , sea, rain ,wine ,saliva or any other source .
Explanation:
