Aballoon that contains 0.750 moles of gas has a volume of 16.8 l. if additional gas causes the balloon to expand to a volume of 25.4 l at a constant pressure and temperature, how many moles of gas does the balloon now contain?

Which position represents spring in the southern hemisphere? a) b) c) d)

Why is the melting of ice a physical change ?

Which sentence from holes contains an implied personality trait? stanley and his parents had tried to pretend that he was just going away to camp for a while, just like rich kids do. he'd just been in the wrong place at the wrong time. stanley felt somewhat dazed as the guard unlocked his handcuffs and led him off the bus. stanley nodded to show he understood