Question

C → CO2 → K2CO3 → CaCO3 → Ca(NO3)2 → O2

Answer 1

C + O2 = CO2.

CO2 + K2O = K2CO3.

K2CO3 + CaBr2 = 2KBr + CaCO3 (↓).

CaCO3 + 2HNO3 = Ca(NO3)2 + H2O + CO2 (↑).

Ca(NO3)2 =(t) Ca(NO2)2 + O2 (↑).

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Answer 2

It appears you've listed a series of chemical reactions, starting with the element carbon (C) and ending with oxygen (O2). Let's break down each step in this sequence:

1. C → CO2: This represents the combustion or oxidation of carbon (C) to carbon dioxide (CO2). It's a common reaction when carbon-containing materials burn in the presence of oxygen.

2. CO2 → K2CO3: This step involves the reaction of carbon dioxide (CO2) with potassium oxide (K2O) or a potassium base to form potassium carbonate (K2CO3).

3. K2CO3 → CaCO3: Here, potassium carbonate (K2CO3) reacts with calcium chloride (CaCl2) or a calcium source to produce calcium carbonate (CaCO3). This might involve a double displacement reaction, where the potassium ions (K+) and calcium ions (Ca2+) exchange places.

4. CaCO3 → Ca(NO3)2: This step likely involves the reaction of calcium carbonate (CaCO3) with nitric acid (HNO3) to form calcium nitrate (Ca(NO3)2).

5. Ca(NO3)2 → O2: This step is a bit unusual. Calcium nitrate (Ca(NO3)2) is not typically used to produce oxygen (O2). Oxygen gas is usually produced through processes like electrolysis of water or decomposition of hydrogen peroxide (H2O2). The presence of nitrogen (N) and oxygen (O) in calcium nitrate doesn't directly lead to the formation of oxygen gas.

If you have specific conditions or reactions in mind for each step, please provide more details, and I can give you a more accurate explanation. Additionally, if you're trying to understand a particular chemical process or reaction pathway, please provide more context so I can assist you better.