chemistry
posted by anne .
A compound,KBrOx, is analyzed and found to contain 52.92% Br by mass. What is the value of x?

Find the RMM (R) of KBrOx by adding the relative atomic mass (RAM) of the ingredients. Keep the x in the formula.
The RAM of Bromine is 79.9,
so
R=39+79.9+16x (approximate)
79.9/R = 52.92/100
Solve for x and round to the nearest integer.