3. A certaln copper ore contalns 3.GG of CuS by mass, and the remainder of the o

Question

3. A certaln copper ore contalns 3.GG of CuS by mass, and the remainder of the ore contalns no copper. In a particular year, a single open-alr smelt furnace heated 34000 tons of thls ore. Compute the maxlmum mass f opper metal that could have been obtained by this process. Clarification: The tons in this problem are English tons, with 1 ton = 2000 lb. You can answer in g, kg, or lb, but the computer does not understand tons as a unit for the answer.) Try doing this In steps. You need to account for the percentage of the are that Is CuzS and also for the fraction of cuzs that is actually copper Submit Answer | Incorrect. Tries 10/99 Previous Tries

Explanation / Answer

Answer

1987300Ib

Explanation

Mass % of Cu2S = 3.66%

mass of Ore processed = 34000tons

mass of ore =(3.66/100)×34000 = 1244.4tons

Mass % of Cu in Cu2S = (127.1g/159.17g)×100 = 79.85%

mass of Cu maximum produced = (79.85/100)×1244.4tons =993.65tons

1ton = 2000lb

993.65tons = 1987300Ib

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