1.12 (higher tier) Calculate the relative atomic mass of an element from the relative masses and abundances of its isotopes Flashcards
1
Q
What isotopes make up a sample of chlorine gas?
A
Chlorine-35 and chlorine-37.
2
Q
What is the percentage composition of chlorine-35 in the sample?
A
75%.
3
Q
What is the percentage composition of chlorine-37 in the sample?
A
25%.
4
Q
How is the R.A.M. of chlorine calculated?
A
R.A.M. = (mass of isotope-A x % of isotope-A + mass of isotope-B x % of isotope-B) / 100.
5
Q
What values are used to calculate the R.A.M. of chlorine?
A
R.A.M. = (35 × 75 + 37 × 25) / 100.
6
Q
What is the calculated R.A.M. of chlorine?
A
35.5.
