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OCR chemistry A sample paper H432/01

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OCR chemistry A sample paper H432/01

Does anyone know how to do thi question?
"A chemical company receives an order to supply 1.96 × 10^10 dm3 of ammonia at room temperature and pressure. The Haber process produces a 95.0% yield.
Calculate the mass of hydrogen, in tonnes, required to produce the ammonia. Give your answer to three significant figures"