What is the volume of 1.9 moles of chlorine gas (Cl2) at standard temperature and pressure (STP) ?

12 L

22.4 L

43 L

81 L

I know there are 4.5*10^-9 seconds in 4.5 nanoseconds, but when I enter it into my TI-30xIIs, I get 4.5*10^-10. I enter it as 4.5 * (1/10^9) in my calculator ... what am I doing wrong?

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What is the volume of 1.9 moles of chlorine gas (Cl2) at standard temperature and pressure (STP) ? 12 L 22.4 L 43 L 81 L