Passage VII
Consider an aqueous solution separated from pure H2O by a membrane permeable to H2O but impermeable to solute particles. H2O will flow from the region of lower particle concentration (the pure H2O) into the region of higher particle concentration (the solution). The pressure associated with this flow is the osmotic pressure, π, given in atmospheres (atm) by the equation:
π = 0.0821 × T × i × C
Table 1 defines the 3 variables in the equation.
Table 2 lists, for 8 substances, the value of i and the molar mass (the mass of 1 mole of a substance).
Figure 1 shows how π varies with C for aqueous NaCl solutions and aqueous glucose solutions at 3 temperatures.
39. Suppose a 1 L solution is produced by dissolving 2 moles of KCl in H2O. Based on the information provided, π, in atm, of this solution at 290 K can be calculated using which of the following expressions?
Your Answer is
Correct Answer is C
Explanation
Look at the formula π=0.0821×T×i×C in the introduction part of the article. According to the information in the question stem, C=2 mole/L at this time, so π=0.0821×290×2×2