The molarity of NaBr = 0.05036M
<h3>
calculation</h3><h3>Step1: calculate the total mass</h3>
0.0460 m NaBr has 0.0460 moles NaBr with 1000g of solvent
therefore the mass of NaBr= 0.0460 moles x 102.89 g/mol =4.73grams
total mass is therefore= 4.733 g +1000= 1004.73 grams
step 2:
use the density to determine the volume
vol=mass/density
=1004.73 g/1.10 g/mol=913.39 ml in liters= 913.39/1000=0.91339 L
now the molarity = moles/vol in liters
=0.0460 m/0.91339=0.05036 M
Answer:
The answers are:
Purines:
C. contain four ring nitrogen atoms.
E. contain two heterocyclic rings.
Pyrimidines:
C. contain only two ring nitrogen atoms.
E. contain one heterocyclic ring.
Explanation:
Purines and Pyrimidines are nitrogenous bases which are the building blocks of nucleic acids (DNA and RNA).
<u>Purines</u> are composed by two fused heterocyclic rings, one of them is a 6-ring and the other is a 5-ring. Each ring contains two nitrogen atoms which form part of the ring. Thus, the nitrogen positions in purines are: 1', 3', 7' and 9'. Depending on the functional groups bonded to the two-ring structure, a purine base can be Guanidine (G) or Adenine (A).
The structure of <u>Pyrimidines</u> is a single heterocycle ring wich contains two nitrogen atoms in positions 1' and 3'. Depending of the functional groups, they can be: Cytosine (C), Thymidine (T) and Uracil (U, which is found in RNA).
Answer:
Because the number of subatomic particles is finite.
Explanation:
You probably know that in addition to electrons, protons, there are many other subatomic particles with strange names like quarks, neutrinos, muons, bosons, etc.
There are many ways in which these could theoretically be combined to make atoms of new elements.
However, the number of different subatomic particles is finite, so the number of possible combinations is also finite.
Even if scientists discover more new subatomic particles, the number of possible combinations will increase, but it will still be finite.
Thus, there is a finite number of elements in the universe.
Answer:
the energy required passive does not use energy while active does
Explanation: