Given the unbalanced equation: ___C2H6 + ___O2 → ___CO2 + ___H2O a) If 7.80 moles of C2H6 are used, how many moles of oxygen are required? 2.23 moles Oxygen 54.6 moles Oxygen 27.3 moles oxygen 15.6 moles Oxygen

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.