One question with three parts **Foundations of Chemistry**---### Part A**Heliox,** a breathing gas that is 79 percent He and 21 percent O₂, for patients who have difficulty breathing.- [ ] Solute: O₂; Solvent: He- [ ] Solute: He; Solvent: O₂[Submit] [Request Answer]---### Part B**Infants’ acetaminophen drops** containing 80 mg acetaminophen per 0.8 g of water.- [ ] Solute: Water; Solvent: Acetaminophen- [ ] Solute: Acetaminophen; Solvent: Water[Submit] [Request Answer]---### Part CA tincture containing a small amount of **white willow bark** dissolved in ethanol.- [ ] Solute: White willow bark; Solvent: Ethanol- [ ] Solute: Ethanol; Solvent: White willow bark[Submit] [Request Answer]---[Provide Feedback]

We need to determine solute and solvent in all these parts. In a solution, solute is that substance which is present in less amount. While solvent is that substance which is present in more amount. A solute dissolve in solvent to make a solution. In the given gas , 79 percent is helium and 21 percent is O2 . As percent of He is higher , this means He is a solvent in this gas. As percent of O2 is lower that means O2 is a solute. So, correct option is : solute, O2 ; solvent , He In the drops , 80 mg is acetaminophen and 0.8 g is water. As , 1 g = 1000 mg So, mass of water in mg = 0.8 × 1000 = 800 mg So, we can see that mass of water is higher than mass of acetaminophen. So, water is a solvent and acetaminophen is a solute in this drop. Correct option is, ; solute , acetaminophen ; solvent , water It is given that in tincture, a small amount of white willow bark is dissolved in Ethanol. That clearly means white willow bark is in less amount so it is a solute. Ethanol is in higher amount so it would be a solvent. Correct option is : solute , White willow bark; solvent, ethanol