Question

If 1.2 kilograms of rust forms on a bridge in 5 days, what should be the rate of reaction in grams per hour?

Answer 1

we have 1.2 kg of rust whithin 5 days.
the rate of reaction in grams per hour:

1.2 kg/5 day * 1000 g/kg * 1 day/24 hours = 10.0 grams/hour

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