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.

Use examples from the article to explain one positive and one negative effect that chemistry has had on society

According to the diagram; a) identify the anode of the cell and write the half-reaction that occurs there b) write the overall equation for the reaction that occurs as the cell operates c) calculate the value of the standard cell potential ,e cell. d)write the shorthand notation of the cell above e)indicate the flow of the electrons on the diagram

What substance has a mass of 9.5g and volume of 2.1cm^3