Answer
See the answer below.
Work Step by Step
Performing the unit conversions:
$210\ mmHg×1\ atm/760\ mmHg=0.276\ atm$
$210\ mmHg×1.01325\ bar/760\ mmHg=0.280\ bar$
$210\ mmHg×101.325\ kPa/760\ mmHg=28.0\ kPa$
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