Given the reaction: 2Na + 2H20 - 2NaOH + H2
How many moles of Na are needed to produce exactly 5.6 liters of H2, measured at STP?
A. 1.0
B. 2.0
C. 0.25
D. 0.50

Please include an explanation as well.

Aluminum reacts with chlorine gas to form aluminum chloride via the following reaction: 2al(s)+3cl2(g)→2alcl3(s) what is the maximum mass of aluminum chloride that can be formed when reacting 32.0 g of aluminum with 37.0 g of chlorine? express your answer to three significant figures and include the appropriate units.

Iam in desperate need of with this !

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )