What is its average relative atomic mass?

If titanium (Ti) has 3 naturally occurring isotopes, titanium-47(43.5%), titanium-48(44.1%), and titanium-50 (12.4%), what is its average r.a.m.?
A. 47.81
B. 3.33
C. 20.445
D. 21.168

1 Answer
May 30, 2018

A. 47.81
B. 3.33
C. 20.445
D. 21.168

Is it not the only one that is remotely close to #"47 g/mol"#? An average must lie in between the numbers averaged, and each titanium isotope has an isotopic mass close to its mass number.

#M_I("Ti"-47) ~~ "47 amu"#
#M_I("Ti"-48) ~~ "48 amu"#
#M_I("Ti"-50) ~~ "50 amu"#

Thus, the average relative atomic mass MUST WITHOUT A DOUBT be between 47 and 50.

#"47 g/mol" cdot 0.435 + "48 g/mol" cdot 0.441 + "50 g/mol" cdot 0.124#

#=# #ulcolor(blue)"47.813 g/mol"#