Question

I am reviewinf for an exam and this was my quiz. I get everythinf except where I got the 72.5 g A. I literally cannot figure it out.

lead cromium oxide x 2. A compound A3X is 39.2% A by mass. What mass of this compound contain 72.5 grams of A? mass. What mass of this compound will [4 pts] 39.2% A 60.8%8 (22.5 g) 1009 Az 184,45 GAA 26A 74 TURN OVER: Q3 IS ON THE BACK. Page 1 of 2

Answer 1

since 100 gm compound have 39.2 gm of A and question ask how many gm of compound will have 72.5 gm of A. 72.5 gm of A is already mentioned in question.

Mass of compound = ( 72.5 gm of A ) x ( 100 gm A₃X / 39.2 gm A ) = 184.95 gm A₃X