Where did the 760 mm Hg come from?

The question asks to find the pressure of mercury gas in mm. It has 0.697 mol of neon gas at a temperature of 21.0 degrees celcius and t occupies 20.6 liters. I understand how they used ideal gas law to find pressure expressed in atmosphere but when converting the pressure to mm Hg how did they get 760 mm Hg? It’s not the molar mass of hg


It takes the pressure of 1 atmosphere to sustain 760 mm of mercury in a barometer tube, so 760 mm Hg is officially defined as an equivalent of 1.00 atmospheres.

Roger the Mole

760 mmHg are units of pressure equal to 1 atm.

Born Yesterday

760 mmHg = one bar = 101.3 kPa = 14.7 psi Since 1 mole occupies 22.4 liters at 0°C .697 would occupy ≈ 15.6 at 0°C Correcting for temperature, 15.6 × 294/273 ≈ 16.8 liters To expand 16.8 to 20.6, pressure would drop by 16.8×760/20.6 ≈ 620 mmHg Update if you need more.