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Final answer:To convert 0.890 atm to mmHg, multiply by the conversion factor of 760 mmHg/atm, resulting in 676.4 mmHg. The closest answer choice is b) 676 mmHg.Explanation:To calculate how many mmHg are in 0.890 atm of pressure, we use a simple conversion factor, knowing that 1 atm equals 760 mmHg. Therefore, we multiply the pressure in atm by the conversion factor to get the pressure in mmHg.The calculation is as follows:0.890 atm × 760 mmHg/atm = 676.4 mmHgThus, the correct answer is b) 676 mmHg....