Question: 7 . Given that phosphate rock contains 3 0 % phosphorus by mass, how much phosphate rock is required to produce 5 0 0 kg

7. Given that phosphate rock contains 30% phosphorus by mass, how much phosphate rock is required to produce 500 kg of phosphoric acid (HPO), assuming the extraction efficiency is 85%?
8. A super phosphate fertilizer contains 18% phosphorus. How much super phosphate is required to provide 50 kg of phosphorus to a field?

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