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A 70‑kg adult human consumes 250 mg of oxygen per minute at rest. How many grams of oxygen does this adult consume in 6 hours?

medium 2 marks Class 7 · Science · Respiration in Organisms
Answer
90 g

The correct answer is 90 g — Answer: 90 g

Step-by-step solution

  1. Convert minutes to hours: 6 hours = 6 × 60 = 360 minutes.
  2. Calculate total oxygen consumption: 250 mg/min × 360 min = 90,000 mg.
  3. Convert milligrams to grams: 90,000 mg ÷ 1,000 mg/g = 90 g.
  4. Answer: 90 g
Common mistake: forgetting to convert mg to g

Concept tested: oxygen consumption calculation

Published · How this solution was prepared and checked

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