Palladium absorbs hydrogen to give the non-stoichiometric interstitial hydride PdH_0.6 (Pd = 106, H = 1). The mass percentage of hydrogen in this compound is closest to

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Palladium absorbs hydrogen to give the non-stoichiometric interstitial hydride $PdH X_{0.6}$ (Pd = 106, H = 1). The mass percentage of hydrogen in this compound is closest to

One formula unit has mass

106 + 0.6 = 106.6

and contains

0.6

of hydrogen. Mass percentage =

0.6/106.6 \times 100 = 0.56%

. The 0.93% value corresponds to the formula

PdH

and 1.12% to a mistaken use of

H X_{2}

mass.