The relative mass of the sample : 18.94
The elements in nature have several types of isotopes
Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.
So Isotopes are elements that have the same Atomic Number (Proton)
Atomic mass is the average atomic mass of all its isotopes
Mass atom X = mass isotope 1 . % + mass isotope 2.%
F-19 = 94% of the sample
F-18 = 100%-94%=6% of the sample
The relative mass :
The answer would be c as the cart is not in motion therefor ruling out kinetic and it is completely at rest making all of it energy potential
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Moles of O_2:-
Mass of O_2:-
Option B