Calculate the diffusive force (j) experienced by potassium in a cell where the concentration gradient is 35 mm, the membrane width is 1 cm, solubility of potassium across the membrane is 1 and the diffusive area (number of channels available) is 10. assume that the cell is at 1 degree c.

j = [(c1-c2)*tsa]/∆x

Achemistry student weighs out of phosphoric acid , a triprotic acid, into a volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with solution. calculate the volume of solution the student will need to add to reach the final equivalence point. round your answer to significant digits.

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

Calculate the mass of carbon in 97.0 g of sucrose c12h22o11