Question

Mary entered an abandoned railroad tunnel at precisely 1:30 PM. Mary carried a carbide lamp, 64.2 grams of calcium carbide, and a water bottle containing 75.0 mL of non-potable water for the lamp. She lit her carbide lamp at 1:35 PM and started walking toward the end of the tunnel 5.5 miles away. Her lamp burned the acetylene generated by the lamp at a rate of 5.0 grams per hour. If she walked out of the tunnel at a rate of 2.0 miles per hour, answer the questions:

                        CaC₂(s)    + 2 H₂O    →    C₂H₂(g)    +      Ca(OH)₂(s)   

2 C₂H₂    + 5 O₂     → 4 CO₂    + 2 H₂O

a) Which reagent is limiting, the CaC₂ or the water? b) How many grams of acetylene were generated by the lamp?c) Can she exit the tunnel before the lamp burns out? What time will she exit the tunnel?

Answer 1