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    Niobium Converted to Niobium Hydride

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    In one experiment, 0.780 g Nb (s) was sealed in a 28.0 mL glass tube at 25°C under 6.33 atm of hydrogen gas, H2. After reacting with the hydrogen for one week, all of the niobium had been converted to niobium hydride, NbH. Calculate the final pressure of hydrogen gas in the system at 25°C.

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    Solution Preview

    First write the reaction:
    2Nb + H2 = 2NbH
    According to reaction stoichiometry, 2 moles of Nb will react with 1 mole of Hydrogen.
    Atomic mass of Nb = 93 (g/mol)
    Number of mole available in this ...

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