CHEMISTRY · Single correct · A Level · Chemistry · Amount of substance · Amount of substance
Problem
A 10.0 g ore sample contains 85.0% CuS by mass. The CuS is completely roasted in excess O2 according to 2 CuS(s) + 3 O2(g) → 2 CuO(s) + 2 SO2(g).
What mass of CuO(s) is produced?
(a) 8.4g
(b) 7.1g
(c) 9.8g
(d) 6.0g