2. Baking soda is sodium bicarbonate (NaHCO3). When you heat baking soda, it breaks down into sodium carbonate powder (Na2CO3), water vapor, and carbon dioxide. The enthalpy of this reaction is 129 kJ. Write a correct thermochemical equation for this reaction, explain how you came up with this equation, and explain what it tells you about the reaction.
I really don't know what you want.
2NaHCO3(s) + heat ==> Na2CO3(s) + CO2(g) + H2O(g) delta H = +129 kJ.
The thermochemical equation for the breakdown of baking soda can be written as follows:
2 NaHCO3 (s) -> Na2CO3 (s) + H2O (g) + CO2 (g) ΔH = 129 kJ
To come up with this equation, we need to ensure that the equation is balanced and shows the correct states of matter for each species involved.
1. We start by writing the chemical formula for baking soda, which is NaHCO3.
2. Next, we identify the products of the reaction. According to the given information, those products are sodium carbonate (Na2CO3), water vapor (H2O), and carbon dioxide (CO2).
3. To balance the equation, we need to ensure that the number of each type of atom is the same on both sides.
In this case, we have two sodium atoms on the right side (Na2CO3), so we need to place a coefficient of 2 in front of NaHCO3 on the left side. This gives us 2 NaHCO3.
We also need two hydrogen atoms on both sides, which are already balanced.
4. Finally, we need three oxygen atoms on the left side to match the three oxygen atoms in the products. Since there is only one oxygen atom in NaHCO3, we place a coefficient of 3 in front of H2O on the right side. This gives us H2O (g).
The equation is now balanced. It shows that when baking soda is heated, it decomposes into sodium carbonate powder, water vapor, and carbon dioxide.
The positive enthalpy change (ΔH = 129 kJ) tells us that this is an endothermic reaction, meaning that it requires an input of energy to occur. In other words, the reactants (baking soda and heat) absorb energy from their surroundings to form the products. The enthalpy change value of 129 kJ indicates the magnitude of energy absorbed in this reaction.
The correct thermochemical equation for the reaction is:
2 NaHCO3(s) → Na2CO3(s) + H2O(g) + CO2(g) ΔH = 129 kJ
To understand how this equation is derived, we need to analyze the given information.
Firstly, the starting reactant is baking soda, which is sodium bicarbonate (NaHCO3). It breaks down, yielding sodium carbonate powder (Na2CO3), water vapor (H2O), and carbon dioxide gas (CO2).
The coefficient "2" in front of NaHCO3 indicates that two molecules of baking soda are required for the reaction to occur.
The state symbols "(s)", "(g)", and "(aq)" are used to represent the states of matter. In this case, "(s)" indicates the solid state, "(g)" indicates the gaseous state, and "(aq)" would indicate an aqueous solution.
Finally, the ΔH value of 129 kJ indicates the enthalpy change for the reaction, which represents the amount of heat absorbed or released during the reaction. In this case, the positive value indicates that the reaction is endothermic, meaning it requires the input of heat or energy.
Therefore, based on this information, the thermochemical equation can be properly written as:
2 NaHCO3(s) → Na2CO3(s) + H2O(g) + CO2(g) ΔH = 129 kJ
This equation tells us that when two molecules of baking soda are heated, they decompose to form one molecule of sodium carbonate, one molecule of water vapor, and one molecule of carbon dioxide gas. Additionally, it informs us that the reaction is endothermic, meaning heat is absorbed during the process.