When a nonvolatile solute is dissolved in a volatile solvent, the vapor pressure

Question

When a nonvolatile solute is dissolved in a volatile solvent, the vapor pressure of the solvent over the solution increases as the mole fraction of solute increases. decreases as the mole fraction of solute increases. is independent of the mole fraction of solute. changes in an unpredictable way with changes in the mole fraction of the solute. decreases as the temperature increases. Which of the following reactions is the most likely to be endothermic? 2 Na(s) + 2 H_2O(l) rightarrow 2 Na^+ (aq) + 2 OH^- (aq) + H_2(g) 2 Mg(s) + O_2(g) rightarrow 2 MgO(s) 2 NaCl(s) rightarrow 2 Na(s) + Cl_2(g) Na^+(g) + e^- rightarrow Na(g) Cl_2(g) + 2e^- rightarrow 2 Cl^-(g) Which of the following is not true for an exothermic reaction? Meat flows from the reaction system to the surroundings. The temperature of the surroundings rise. The enthalpy change for the reaction is negative. The products have a higher energy than the reactants. The bonds in the products are stronger than the bonds in the reactants.

Explanation / Answer

3. Answer is B, you are right.

Raoults law: vapor pressure of solution = molefraction x vapor pressure of pure solvent

Non-volatile solute decreases vaopr pressure of solvent,

4. A and C

%. D

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