Answer:
![2.14*10^{-3} mol](https://tex.z-dn.net/?f=2.14%2A10%5E%7B-3%7D%20mol)
Explanation:
number of moles of C8H9NO2 = ![\frac{mass}{molar mass}=\frac{324*10^{-3} g}{151.163g/mol}=2.14*10^{-3}mol](https://tex.z-dn.net/?f=%5Cfrac%7Bmass%7D%7Bmolar%20mass%7D%3D%5Cfrac%7B324%2A10%5E%7B-3%7D%20g%7D%7B151.163g%2Fmol%7D%3D2.14%2A10%5E%7B-3%7Dmol)
The trick is to remember to convert milligrams to grams because molar mass is normally presented in grams per mole
Answer:
4) Each cytochrome has an iron‑containing heme group that accepts electrons and then donates the electrons to a more electronegative substance.
Explanation:
The cytochromes are <u>proteins that contain heme prosthetic groups</u>. Cytochromes <u>undergo oxidation and reduction through loss or gain of a single electron by the iron atom in the heme of the cytochrome</u>:
![Cytochrome-Fe²⁺ ⇄ cytochrome-Fe³⁺-e⁻](https://tex.z-dn.net/?f=Cytochrome-Fe%C2%B2%E2%81%BA%20%E2%87%84%20cytochrome-Fe%C2%B3%E2%81%BA-e%E2%81%BB)
The reduced form of ubiquinone (QH₂), an extraordinarily mobile transporter, transfers electrons to cytochrome reductase, a complex that contains cytochromes <em>b</em> and <em>c₁</em>, and a Fe-S center. This second complex reduces cytochrome <em>c</em>, a water-soluble membrane peripheral protein. Cytochrome <em>c</em>, like ubiquinone (Q), is a mobile electron transporter, which is transferred to cytochrome oxidase. This third complex contains the cytochromes <em>a</em>, <em>a₃</em> and two copper ions. Heme iron and a copper ion of this oxidase transfer electrons to O₂, as the last acceptor, to form water.
Each transporter "downstream" is <u>more electronegative</u><u> than its neighbor </u>"upstream"; oxygen is located in the inferior part of the chain. Thus, the <u>electrons fall in an energetic gradient</u> in the electron chain transport to a more stable localization in the <u>electronegative oxygen atom</u>.
Answer:
The new temperature of the water bath 32.0°C.
Explanation:
Mass of water in water bath ,m= 8.10 kg = 8100 g ( 1kg = 1000g)
Initial temperature of the water = ![T_1=33.9^oC=33.9+273K=306.9 K](https://tex.z-dn.net/?f=T_1%3D33.9%5EoC%3D33.9%2B273K%3D306.9%20K)
Final temperature of the water = ![T_2](https://tex.z-dn.net/?f=T_2)
Specific heat capacity of water under these conditions = c = 4.18 J/gK
Amount of energy lost by water = -Q = -69.0 kJ = -69.0 × 1000 J
( 1kJ=1000 J)
![Q=m\times c\times \Delta T=m\times c\times (T_2-T_1)](https://tex.z-dn.net/?f=Q%3Dm%5Ctimes%20c%5Ctimes%20%5CDelta%20T%3Dm%5Ctimes%20c%5Ctimes%20%28T_2-T_1%29)
![-69.0\times 1000 J=8100 g\times 4.18 J/g K\times (T_2-306.9 K)](https://tex.z-dn.net/?f=-69.0%5Ctimes%201000%20J%3D8100%20g%5Ctimes%204.18%20J%2Fg%20K%5Ctimes%20%28T_2-306.9%20K%29)
![-69,000.0 J=8100 g\times 4.18 J/g K\times (T_2-306.9 K)](https://tex.z-dn.net/?f=-69%2C000.0%20J%3D8100%20g%5Ctimes%204.18%20J%2Fg%20K%5Ctimes%20%28T_2-306.9%20K%29)
![T_2=304.86 K=304.86 -273^oC=31.86^oC\approx 32.0^oC](https://tex.z-dn.net/?f=T_2%3D304.86%20K%3D304.86%20-273%5EoC%3D31.86%5EoC%5Capprox%2032.0%5EoC)
The new temperature of the water bath 32.0°C.
The answer for the following questions is explained below.
Explanation:
The two variables that affect kinetic energy are:
- mass and
- velocity
- velocity - The faster an object moves,the more the kinetic energy it has.
- mass - Kinetic energy increases as mass increases
The kinetic energy of an object depends on both its mass and its velocity
Kinetic energy increases as mass increases
For example,think about rolling a bowling ball and a golf ball down a bowling lane at same velocity
Here,the bowling ball has more mass than the golf ball
Therefore you use more energy to roll the bowling ball than to roll the golf ball
The bowling ball is more likely to knock down the pins because it has more kinetic energy than the golf ball