Consider the reaction:
2C₂H₂(g) + 2H₂(g) -> C₂H₆(g)
A reaction mixture is prepared with an initial C₂H₂ partial pressure of 0.676 atm. After 2.70 min, the C₂H₂ partial pressure is measured to be 0.113 atm. Calculate the average rate of change of C₂H₂ (in atm/min) in the first 2.70 min of the reaction. Be sure to include the correct sign (+/-) with your answer.
Report your answer to 3 significant figures without the unit. Example: 0.015