How many Sodium (Na) atoms are in 6NaCl?

100mg magnesium reacts with 20ml of 1.0m hcl

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm

Which change to the system wood cause the freely-moving piston to lower?