Discussion
Superphosphate is made by treating rock with sulphuric acid. If the rock is 30 per cent phosphorus pentoxide and the product is 16 per cent, how much product comes from one tonne of rock, ignoring losses?
Answer: D
The phosphorus pentoxide is conserved, so three hundred kilograms at sixteen per cent implies about one point nine tonnes of product. The added acid and water account for the increase in mass. Tracking the pentoxide is the whole calculation.
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