Table 1 contains data about two completely ionised samples of pure boron. Each sample contains only isotopes X and Y.
Table 1

Sample | Number of ions Mass of Charge on

number in sample = ple / kg each ion/ C
fot | 3.50 x 1016 6.31 x 107! +1.60 x 10719
3.50 x 10” 6.20 x 10°? +1.60 x 10°?
Deduce which sample, 1 or 2, contains a greater percentage of isotope Y.

[3 marks]