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What pressure will be exerted by 0.675 moles of a gas at 25*c if it is in a 0.750-l container?

If the density of water is 1.0 g/cm3, which of these materials would float in water, based on their densities? check all that apply. aluminum cork iron lead wax

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !