You inflate a balloon to 1L at sea level where the atmospheric pressure is 760 mmHg. You then take this balloon with you as you pilot a spaceship to Mars, where the atmospheric pressure is 6 mmHg. When you step out of your spaceship on Mars, the balloon's size will because the transmural pressure . g

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.

10 years is the answer