C-06-Q041mediumsingle_mcqAt STP, 1.12 L O2\mathrm{O_2}O2 contains molecules—a3.01×10223.01 \times 10^{22}3.01×1022b6.023×10226.023 \times 10^{22}6.023×1022c6.023×10236.023 \times 10^{23}6.023×1023d1.2×10231.2 \times 10^{23}1.2×1023