Answer:
B. Conductivity can be used to calculate the salinity of the water.
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A. hex- Normally with 6, the prefix is hex-. For example a polygon having 6 sides is known as hexagon.
#2. Percent error (or deviation) is calculated as ((TV-EV)/EV))*100
multiply the number of each atom with its molecular mass. (see the periodic table)
5*12 + 12*1 = 72 gram per mole.
Or more accurately: 5*12.01078 + 12*1.007947 = 72.149264 g/mole
the semipermeable membrane surrounding the cytoplasm of a cell.