Answer:
Explanation: Moles ethanol = 21.9 g x 1 mole/46 g = o.476 moles
moles water = 53.6 g x 1 mole/18 g = 2.98 moles
total moles = 0.476 + 2.98= 3.456 moles
mol fraction ethanol = 0.476/3.456 = 0.138
Answer:
The reason why the imidazole side chain of histidine can function as either acid or base catalyst is: I and II: Option A.
Explanation:
The imidazole group of the histidine has a pKa of 6.0, which is closer to the pKa of the physiological environment. Thus, at every reaction, either acidic or basic, the side chain act as a buffering catalyst, which can be useful irrespective of the pH of the reactants. Also, since the reaction of a catalyst is influenced by the pH of the environment, at physiological pH, the sulfur in the ring can be protonated by acidic reaction or deprotonated by the primary reaction within the physiological environment.
Answer:
309.2 ml of oxygen
Explanation:
2 ( 12X2 +Ix 2 ) = S2 ml
O2 = 5 x 16 x 2 = 160 ml
volume of O2 needed = 160×100. 5 / 52 = 309.2 ml
Answer:
Matter that has the same composition and properties throughout is called a substance.
Explanation:
That’s what I’m tryna figure out