Question

if the manometer reading is 305 mm and the atmospheric pressure is 1.03 atm, what is the pressure of the gas in the flask?

Answer 1

we need to make sure that the pressure is in the same units.

let's convert the atm to mmHg. remember that 1 atm= 760 mmHg

1.03 atm (760 mmHg/ 1 atm)= 783 mmHg

to find the pressure of the gas, you just need to subtract the values

pressure of gas= 783 - 305 = 478 mmHg