Question

Which of the following compounds has the lowest percent gold content by mass which one has the highest percent gold content by weight?

a. AuOH
b. Au(OH)3
c. AuCI3
d. AuI3

Answer 1

Answer:D. AuI3

Step-by-step explanation:

Answer 2

highest percentage of gold by weight can be determined by looking at the atomic mass of the other elements in the compound. the smaller the total of mass of the other elements, the heigher the percentage of Au will be in that compound

a. AuOH, OH- = 17 gram/mole
b. Au(OH)3, 3 x OH- = 3 x 17 = 51 gram/mole
c. AuCl3 = 3x35.5= 106.5 gram/mole
d. AuI3 = 3x127 = 381 gram/mole


as we can see AuOH has the least Molecular mass, hence % of Au will be the highest compared to other choices

Answer: A