Is the C because the mass in the compound is correct
Moles/MxL
1.709moles/2.10L =<span>0.814M</span>
The answer is A because if you place the first two numbers 1 and 3
Au=2
S=3
H=6
It has to equal to the product so then you put in the last two numbers 2 and 3
Au=2
S=3
H=6
Becoing itsodim fromate t will have pb of 67