A sample of glucose, C6H12O6, has a mass of 300.0g. How many moles of carbon atoms are in the sample?

10 moles

Explanation:

C6H12O6 is glucose and we shall get its molar mass by summing up molar masses of its elemental components.

C=12 , H=1 , O =16

C6H12O16 = (12*6) + (1*12) + (16*6)

               = 180g/mol

number of moles = mass/molar mass

mass of C6H12O6 =300 g

number of moles of C6H12O6 = 300/180

                                                  = 100/60

mass of Carbon present =

                                        =20g

for 6 carbon atoms we have = 20*6

                                           = 120g

number of moles = mass/molar mass

number of moles , C = 120/12

number of moles of Carbon atoms = 10moles

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.