Liquid octane (ch) has a density of 0.7025 g/ml at 20 °c. find the true mass (murue) of octane when the mass weighed in 18 air is 17.320 g. assume the air density is 0.0012 g/ml and the balance weight density is 7.5 g/ml 17.35

Explanation:

According to Buoyance equation,

          m =

where,      m = true mass

                 m' = mass read from the balance = 17.320 g

              = density of air = 0.0012 g/ml

              = density of the balance = 7.5 g/ml

                    d = density of liquid octane = 0.7025 g/ml

Now, putting all the given values into the above formula and calculate the true mass as follows.

      m =    

          =

          =                

          = 17.317 g

Thus, we can conclude that the true mass of octane is 17.317 g.

its first and third is your answer i did the qustion the fourth isnt right