Question

1. A weather balloon has a capacity of 10 000 L at 100 kPa and 20.00°C. Cesium metal is
reacted with water to fill the balloon with hydrogen gas. How many moles of H₂ must be
generated to fill it?

Answer 1

The number of moles of H₂ that must be generated to fill it is 0.41 mole.

Number of moles of hydrogen gas

Apply ideal gas law;

PV = nRT

n = PV/RT

where;

• P is pressure
• V is volume
• R is ideal gas constant
• T is temperature = 20 °C = 293 K

n = (10 x 100)/(8.314 x 293)

n = 0.41 mole

Thus, the number of moles of H₂ that must be generated to fill it is 0.41 mole.

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