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How to find the barometric pressure in mmHg?

A sample of N2(g) occupies a volume of 42.3 mL under the existing barometric pressure. Increasing the pressure by 87 mmHg reduces the volume to 36.0mL. What is the prevailing barometric pressure, in millimeters of mercury?
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P1V1 = P2V2 (P1)(42.3 ml) = (P1 +87) (36.0ml)42.3 P = 36P + 3132 6.3P = 3132P = 497 mm of Hgyour answer is 497 mm of Hg... Show More
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