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.
37. Compared to the mass of 1 molecule of glucose, the mass of 1 molecule of lactose is:
Your Answer is
Correct Answer is D
Explanation
Look at table 2, the molar mass of glucose is 180, and the molar mass of lactose is 342, so lactose looks at table 2 more, the molar mass of glucose is 180, and the molar mass of lactose is 342, so lactose is bigger