The partial pressures of CH4, N2, and O2 in a sample of a gas mixture were found to be [x] mm Hg, [y] mm Hg, and [z] mm Hg, respectively. Calculate the mole fraction of oxygen.

A bomb calorimeter has a heat capacity of 2.47 kJ/K. When a 0.120-g sample of ethylene (C2H4) was burned in this calorimeter, the temperature increased by 2.44 K. Calculate the enthalpy change per mole of ethylene combusted.

Solve the quadratic equation.t (t + 4) = -5

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