ACS Gen Chem Practice Test 1

10 free ACS Gen Chem practice questions in the real exam format, covering the official content areas, with an explanation for every answer.

ACS Gen Chem Practice Test 1Tutor mode

Question 1 of 10

Atoms

The average atomic mass of gallium is 69.72 u. Based on the data in the table, what is the percent abundance of Ga-69?

Stable isotopes of gallium
Isotope	Isotopic mass (u)
Ga-69	68.926
Ga-71	70.925

Gallium has no other stable isotopes.