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Chemistry: chemical composition of carbon dioxide, weight analysis: H2CO3 + CaO=CaCO2+H2O

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Carbon dioxide was the first gas to be described as a discrete substance. In the seventeenth century the Flemish chemist Jan Baptist van Helmont observed that when he burned charcoal in a closed vessel, the mass of the resulting ash was much less than that of the original charcoal. His interpretation was that the rest of the charcoal had been transmuted into an invisible substance he termed a “gas” or “wild spirit”.

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