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20 February, 09:06

An iron ore was found to contain 92.0% pyrite (fool's gold). Pyrite has the formula FeS2and is 46.5% iron. How many grams of iron are there in 50.8 grams of iron ore?

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  1. 20 February, 09:14
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    Firstly calculate the grams in the last 8 percent before moving onto the pyrite section.

    50.8x0.08=4.064g

    We know that iron ore in this case has 92 percent pyrite which contains 46.5 percent iron so we do 50.8x0.92=46.736g from this we need to find 46.5 percent of the iron content in the 92 percent pyrite section then add this answer to the 8 percent of iron ore we found at the start. 46.736x0.465=21.73224g

    21.73224g+4.064=25.79624g of iron ore 25.8g (3sf)
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