Alungful of air (377 cm3 ) is exhaled into a machine that measures lung capacity. if the air is exhaled from the lungs at a pressure of 1.7 atm at 41.7 ◦c but the machine is at ambient conditions of 0.958 atm and 23 ◦c, what is the volume of air measured by the machine? answer in units of cm3 .

The volume of the gas when the pressure and temperature has changed is

Explanation:

To calculate the volume when temperature and pressure has changed, we use the equation given by combined gas law.

The equation follows:

where,

are the initial pressure, volume and temperature of the gas

are the final pressure, volume and temperature of the gas

We are given:

Putting values in above equation, we get:

Hence, the volume of the gas when the pressure and temperature has changed is

b i think it’s a water wheel turning in a stream

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"