. You study cardiac myocytes to understand cell permeability during action potentials and how that influences differentiation of the cell. Modeling the cell and its environment in 1-D, calculate the flux of water across the membrane (~15nm) if the cell is in a hypotonic solution (H2Ooutside=2 mol/m3 , H2Oinside=3 mol/m3 ). The diffusion coefficient of water at 35oC is ~3x10-3 mm2 /s. Show all work. (5 points)

The zinc within a copper-plated penny dissolves in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can reach the zinc). the reaction between the acid and the zinc 2h+(aq)+zn(s)→h2(g)+zn2+(aq) . when the zinc in a certain penny dissolves, the total volume of gas collected over water at 25 °c is 0.947 l at a total pressure of 743 mmhg . (vapor pressure of water is 23.78 mmhg at 25 °c .) what mass of hydrogen gas is collected? answer in appropriate significant figures