C-06-Q040mediumsingle_mcq22.4 L CO2\mathrm{CO_2}CO2 at STP contains molecules—a6.023×10236.023 \times 10^{23}6.023×1023b2×6.023×10232 \times 6.023 \times 10^{23}2×6.023×1023c6.023×10226.023 \times 10^{22}6.023×1022d1×10231 \times 10^{23}1×1023