Gas Law problems-Ideal Gas Law help?

N = (2.5 L/22.4 L)*(1.4 atm/1 atm)*(273.15K/298.15K) = about 0.15 moles but use calculator. (22.4 L)*(2mol/1mol)*(760/720)*(298.15K/273.15... = about 50L but use calculator. (22.4L/0.5L)*(1 atm)*(25g/44g)*(303.15K/273.15K) = about 30 atm but use calculator.

(273.15K)(900/760)(0.65/22.4)(5/70.9) = use calculator.

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