Which reaction is endothermic?
C + O2 → CO2 C + O 2 → CO 2 N2 + O2 → 2NO N 2 + O 2 → 2NO S + O2 → SO2 S + O 2 → SO 2 2CO + O2 → 2CO2 2CO + O 2 → 2CO 2
The reaction S + O2 → SO2 is endothermic.
The reaction that is endothermic is:
2CO + O2 → 2CO2
In this reaction, carbon monoxide (CO) reacts with oxygen (O2) to produce carbon dioxide (CO2). This reaction requires an input of energy to proceed, making it endothermic.
To determine which reaction is endothermic, we need to understand the concept of endothermic reactions. An endothermic reaction is one that absorbs heat from its surroundings, resulting in a decrease in temperature.
To find out which reaction is endothermic, we need to examine the enthalpy change (∆H) of each equation. Enthalpy change is a measure of the heat energy absorbed or released during a reaction.
Let's look at each reaction and analyze their enthalpy changes:
1. C + O2 → CO2: This reaction involves the formation of carbon dioxide from carbon and oxygen. It is typically an exothermic reaction, meaning it releases heat energy rather than absorbing it.
2. C + O2 → CO: The formation of carbon monoxide from carbon and oxygen is also usually an exothermic reaction.
3. N2 + O2 → 2NO: The reaction between nitrogen gas and oxygen gas to form nitrogen monoxide is also exothermic.
4. N2 + O2 → 2NO: Similar to the third reaction, this equation represents the formation of nitrogen monoxide from nitrogen and oxygen. It is also exothermic.
5. S + O2 → SO2: The formation of sulfur dioxide from sulfur and oxygen is usually an exothermic process.
6. S + O2 → SO: This reaction represents the formation of sulfur monoxide from sulfur and oxygen. It could be either endothermic or exothermic depending on the specific conditions.
7. 2CO + O2 → 2CO2: The reaction between carbon monoxide and oxygen to form carbon dioxide is typically exothermic.
8. 2CO + O2 → 2CO2: Similar to the previous reaction, this equation also represents the formation of carbon dioxide from carbon monoxide and oxygen. It is exothermic.
From the list provided, the reaction that is endothermic is the following:
S + O2 → SO