Question: Lanthanum was reacted with hydrogen in a given experiment to produce the nonstoichiometric compound LaH2.90. Assuming that the compound contains H 2 , La 2+

Lanthanum was reacted with hydrogen in a given experiment to produce the nonstoichiometric compound LaH2.90. Assuming that the compound contains H₂, La²⁺, and La³⁺, calculate the fraction of La²⁺and La³⁺ present.

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