---
date: 2022-05-16
tags:
  - biokemi
  - provfråga
  - termodynamik
---
A biologist studying a new bacterial strain identified in Göteborg is interested in the following two new biochemical reactions:  

P + H₂O -> Q + Pi (∆G = -38 kJ/mol)  
X + Y -> Z + H₂O (∆G = +55 kJ/mol)  

What does ∆G mean in Thermodynamics? Which of the two reactions is spontaneous and what is the explanation for this? /  
En biolog som studerar en ny bakteriestam som har identifierats i Göteborg är intresserad av följande biokemiska reaktioner:  

P + H₂O -> Q + Pi (∆G = -38 kJ/mol)  
X + Y -> Z + H₂O (∆G = +55 kJ/mol)  

Vad avses med ∆G inom termodynamiken? Vilken av reaktionerna är spontan och vilken är anledningen till det?  

This question needs to be answered in English. (2p) (Max 100 words)

**Answer**
```spoiler-block

G (Gibbs free energi) means the change of free energy in the system. Delta-G explains how the free energi in the system change after a specific reaction. Negative delta-G means the reaction is spontaneous, while positive delta-G indicates that the reaction is not spontaneous and is not thermodynamicly favorable. The spontaneous reaction is P + H₂O -> Q + Pi because it has negativ Delta-G.  
```