Answer to Question #168211 in General Chemistry for Sandra Collins

Question

Au2S3 + 3 H2 = 2 Au + 3 H2S

How many formula units of gold (III) sulfide are required to produce 0.050 g of hydrosulfuric acid?

Answer 1

n(H2S) = (0.050 g)/(34 g/mol) = 1.47*10^-3 mol

n(Au2S3) = n(H2S)/3 = 4.90*10^-4 mol

N(Au2S3) = n(Au2S3)*N_A = (4.90*10^-4 mol)*(6.02*10²³ mol^-1) = 2.95*10²⁰ formula units