Phosphine, PH3PH3, is a colorless, toxic gas that is used in the production of semiconductors as well as in the farming industry. When heated, phosphine decomposes into phosphorus and hydrogen gases.   4PH3(g)⟶P4(g)+6H2(g)4⁢PH3⁢(g)⟶P4⁡(g)+6⁢H2⁡(g)   This decomposition is first order with respect to phosphine, and has a half‑life of 35.0 s at 953 K. Calculate the partial pressure of hydrogen gas that is present after 74.5 s74.5 s if

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