The main component of marble is calcium carbonate, and the chemical formula of calcium carbonate is CaCO3 chemical reaction equation: CaCO3+2HCl=CaCl2+H2O+CO2↑.
Chemical formula is a formula to express the composition of chemical substances by means of symbols such as element symbols and numbers, such as brackets, plus sign (+), minus sign (-), short line, etc. Chemical formulas can be divided into experimental formula, molecular formula, structural formula, indicative formula (simplified structure), bond line formula and electronic formula.