A lungful of air (339 cm3 ) is exhaled into a
machine that measures lung capacity. If the
air is exhaled from the lungs at a pressure
of 1.61 atm at 43.6
◦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
.

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt