Respuesta :
The mass % of chalcopyrite in the ore is 0.72% given that there is 0.25% of copper in the ore.
To answer this question, let us first assume that there is 1000 g of ore.
To calculate the mass of chalcopyrite, the following steps must be done.
Step 1: Calculate the mass of copper from the given mass% of copper in the ore.
Mass of copper = 1000 g of ore x (0.25% of copper/100)
Mass of copper= 2.5 g of copper
Step 2: Calculate the moles of copper. (Molecular weight or MW of copper is 63.546 g/mol)
Moles of copper = mass of copper / MW of copper
Moles of copper = 2.5 g / 63.546 g/mol
Moles of copper= 0.039341 mol copper
Step 3: Then, we can now calculate the mass of chalcopyrite (FeCuS2) by using its molecular weight and mole ratio with copper. (MW of chalcopyrite= 183.54 g/mol)
Mass of chalcopyrite= (moles of copper) * ( mole ratio of FeCuS2/ Cu) * (MW chalcopyrite)
Mass of chalcopyrite= 0.039341 mol copper* FeCuS2/Cu * 183.54 g/mol
Mass of chalcopyrite=7.22075 g chalcopyrite
Step 4: Lastly, we can calculate the mass% of chalcopyrite in the ore as shown below.
Mass% chalcopyrite in ore= (7.22075 g / 1000 g) x 100% = 0.72%
For a better understanding of the mole ratio, please refer to the link https://brainly.com/question/15371665.
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