Which of the following has a mass of 40.0 g?
a 1.34 x 1024 molecules H2O
b 2.22 mol H2O
c 1.51 x 1024 atoms o
d all of the above

thinking it would be physical characteristics

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.