[herge]

If you assume staying on the page for 15 minutes with an Mac Book power supply of 85w, it's about 0.05 kg to 11.3 kg depending on where in North America you are.

[SapphireSun]

At 20 deg C, 1 atm, and using the high estimate of 11.3kg, PV = nRT, which is

V

    n = 11300 g / 44 g/mol = 256.82 mol
    R = 8.314 L kPa K−1 mol−1
    T = 293 K
    P = 101.3 kPA

 = (256.82 * 8.314 * 293 / 101.3) L

 = 6175.8 liters

 = 3087.9 uncapped coke bottles every 15 minutes (high estimate)

At the low estimate:

n = 50 / 44 = 1.13 mol

So:

V = 27.33 L

  = 13.7 uncapped coke bottles every 15 minutes (low estimate)

Where did you get the mass estimates from?

[herge]

The EPA and Environment Canada.