Which of the four compounds contains a metal?

HC2H3O2
CaCO3
C3H8
CO2

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To determine which of the four compounds contains a metal, we need to understand the chemical composition of each compound.

1. HC2H3O2: This compound is acetic acid, also known as vinegar. It consists of hydrogen (H), carbon (C), and oxygen (O), but does not contain any metals.

2. CaCO3: This compound is calcium carbonate. It contains three elements: calcium (Ca), carbon (C), and oxygen (O). Calcium is a metal, so this compound does contain a metal.

3. C3H8: This compound is propane, which consists of only carbon (C) and hydrogen (H). It does not contain any metals.

4. CO2: This compound is carbon dioxide, which consists of carbon (C) and oxygen (O). It does not contain any metals.

So, out of the four compounds, only CaCO3 (calcium carbonate) contains a metal.