Final answer:
The average atomic mass of an element is determined by the weighted average of the masses of its isotopes, taking into account their relative abundances. In this case, we need to calculate the relative atomic mass of element c using the given percentages and masses of chlorine-35 and chlorine-37.
Step-by-step explanation:
The average atomic mass of an element is determined by the weighted average of the masses of its isotopes, taking into account their relative abundances.
In this case, we have chlorine-35 and chlorine-37. We know that 75% of the atoms are chlorine-35, with a mass of 35 u, and 25% are chlorine-37, with a mass of 37 u.
To calculate the relative atomic mass of element c, we can use the following formula:
(75% × 35 u) + (25% × 37 u) = average atomic mass of element c
Substituting the values:
(0.75 × 35) + (0.25 × 37) = average atomic mass of element c
By solving this equation, we can determine the relative atomic mass of element c.