At STP for any gas, 22.4 liters = 1 mole. 78.4 L * 1mole/22.4L = 3.50 moles
Answer from: Quest
chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.