C-06-Q137mediumsingle_mcqIn CaCO3→CaO+CO2\mathrm{CaCO_3 \to CaO + CO_2}CaCO3→CaO+CO2, CaO produced from 100 g CaCO3\mathrm{CaCO_3}CaCO3—a56 gb100 gc44 gd80 g