Information about five planets is shown in the table below.

Planet Diameter (km) Mass (kg)
Mercury 4.88*10^3 3.3*10^23
Jupiter 1.43*10^5 1.898*10^27
Earth 1.28*10^4 5.97*10^28
Mars 6.78*10^3 6.42*10^23
Saturn 1.21*10^5 5.68*10^26

a) Write down the name of the planet with the greatest mass.

b)Work out the radius of Mercury giving your answer as an ordinary number.

c) Work out the differences between the masses of Jupiter and Saturn. Give your answer in standard form.