A gas is initially confined to a 1.00 L vessel at 3.00 atm of pressure. A valve connecting the 1.00 L vessel to a 3.00 L vessel is opened and the gas expands. What is the final pressure in atm of the gas after the valve is opened, assuming that the volume of the connecting tube is negligible and there is no temperature change? a. 0.250 atm
b. 0.500 atm
c. 0.750 atm
d. 1.00 atm
e. None of these choices

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