Another gas was used for many years to float transportation balloons.

which gas is it:

1) carbon dioxide
2) oxygen
3) hydrogen

why is this gas not used in balloons today?

How many grams of n2h4 will be consumed by 23 g of n2o4

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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