The thermal decomposition of phosphine (PH3) into elemental phosphorus and molecular hydrogen occurs via first-order kinetics. At a temperature of 680°C the half-life for this process is 35.0 seconds. If the initial concentration of the PH3 is 0.475 M, then what concentration of PH3 will remain after an elapsed time of 2.00 minutes?

4 PH3 (g) → P4 (g) + 6 H2 (g)

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