Question

The density of mercury is 13.5 g/mL and the density of water is 1.00 g/mL. If a mercury barometer reads 805 mmHg, what is the barometric pressure in cmH2O Hint: From physics we find that the pressure is related to the height according to the equation

Answer 1

Barometric pressure will be
`1086.75 cm H_(2)O`

Step-by-step explanation:

We know,
`P=h\rho g`

where P is barometric pressure, h is height of liquid inside barometer,
`\rho` is density of liquid and g is gravitational constant

If barometric pressure is x cm
`H_(2)O` for 805 mm Hg then-

`x* (1.00g/mL)* g=(805* 10^(-1)cm Hg)* (13.5g/mL)* g`

So,
`x=1086.75 cm H_(2)O`

Hence barometric pressure will be
`1086.75 cm H_(2)O`