Using the data in Table 18.22, calculate the mass of argon at 25oC and 1.0 atm in a room 10.0 m × 10.0 m × 10.0 m. How many Ar atoms are in this room? How many Ar atoms do you inhale in one breath (approximately 2 L) of air at 25oC and 1.0 atm? Argon gas is inert, so it poses no serious health risks. However, if significant amounts of radon are inhaled into the lungs, lung cancer is a possible result. Explain the health risk differences between argon gas and radon gas.
Table 18.22

Melting Point (C) Boiling Point (C) Atmospheric Abundance (% by volume) Examples of Compounds Element -270 -249 - 189 157 -112 5 x 10-4 1 x 10-3 Helium Neon Argon Krypton Xenon -269 -246 -186 -153 -107 None None HArF KrF2 9x 10 1 x 10-4 9 x 10-6