- Volume (V) = 21.3 L
- Temperature (T) = 24.3 °C, which needs to be converted to Kelvin. The conversion formula is \(T(K) = T(°C) + 273.15\).
- Pressure (P) = 0.640 atm
- We are asked to find the mass of hydrogen gas (H2), so we need the molar mass of H2. The
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