The electrons generated from the krebs cycle are transferred to and then are nad / bonded to oxygen molecules nadh/ combined with hydrogen and oxygen to form water nad / shuttled to the electron transport chain

The electrons generated from the Krebs Cycle are transferred to NAD+ and then sent to the Electron Transport Chain.

The Kreps cycle is part of cellular respiration. Cellular respiration takes place inside the mitochondria. The main purpose of the mitochondria is to convert glucose into energy that the cell can use. The Krebs Cycle is a never-ending cycle which keeps on repeating itself to produce ATP and gives off CO2. 

The Electron Transport Chain is the mechanism used by the cell for obtaining energy from sunlight during the photosynthesis process. 

Question:

A piston–cylinder device contains 0.85 kg of refrigerant- 134a at -10°C. The piston that is free to move has a mass of 12 kg and a diameter of 25 cm. The local atmospheric pressure is 88 kPa. Now, heat is transferred to refrigerant-134a until the temperature is 15°C. Determine (a) the final pressure, (b) the change in the volume of the cylinder, and (c) the change in the enthalpy of the refrigerant-134a.

a) 90.4 kPa

b) 0.0205 m³

c) 17.4 kJ/kg

Explanation:

Given:

Mass, m = 0.85 kg

a) The final pressure here is equal to the initial pressure. Let's use the formula:

= 90398 Pa

≈ 90.4 KPa

Final pressure = 90.4 kPa

b) Change in volume of the cylinder:

To find the initial and final volume, let's use the values from the A-13 table for refrigerant-134a, at initial values of 90.4 kPa and -10°C and final values of 90.4 kPa and 15°C

v1 = 0.2302m³/kg

h1 = 247.76 kJ/kg

v2 = 0.2544 m³/kg

h2 = 268.2 kJ/kg

Change in volume is calculated as:

Δv = m(v2 - v1)

Δv = 0.85(0.2544 - 0.2302)

= 0.0205 m³

Change in volume = 0.0205 m³

c) Change in enthalpy

Let's use the formula:

Δh = m(h2 - h1)

= 0.85(268.2 - 247.76)

= 17.4 kJ/kg

Change in enthalpy = 17.4 kJ/kg