Can someone please help me? This is due today

I've posted all the questions I need answered here:

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When molecules of water vapor in the air come in contact with a cold can of soft drink , they lose energy ,slow down,and form a liquid due to decrease in ?

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

How many moles are contained in 5.6 l of h2 at stp