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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.

    $$1\quad atm =101325\quad Pa= 760\quad torr=760mm\quad Hg$$

$$\therefore \quad 0.987\quad atm=101.325\quad KPa=760\quad torr=750mm\quad Hg$$

$$\therefore \quad 70mm\ Hg$$ is not standard pressure

Hence, option D is correct.

Chemistry

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