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Question

Which pressure is NOT standard pressure?

A
760 torr
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B
1 atm
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C
101.325 kPa
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D
70 mm Hg
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Solution

The correct option is C 70 mm Hg
Standard Pressure is 1 atm, 101.3 kPa or 760 mmHg or torr.

STP is the standard conditions often used for measuring gas density and volume. At STP, 1 mole of any gas occupies 22.4 L.

1atm=101325Pa=760torr=760mmHg

0.987atm=101.325KPa=760torr=750mmHg

70mm Hg is not standard pressure

Hence, option D is correct.

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