A gas has density 0.87 g/L at 30oC and 131.2 kPa.

Find density at STP.

*Hint use the density of gases equation.

a
.57 g/L
b
.72 g/L
c
.75 g/L
d
.54 g/L

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3