Hannahmiller
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13. Solid sodium reacts violently with water producing heat, hydrogen gas and sodium hydroxide. How many molecules of hydrogen gas are produced when 65.4 g of sodium are added to water? 2Na(s) + 2H2O(l) → 2NaOH (aq) + H2(g)(1 point for molar mass of sodium, 1 point for correct mole ratio, 1 point for work, 1 point for correct answer with correct units) (4 points total) *

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antonsandiego
To make the first step we should remember that the molar mass of sodium is about 23.0 g/mol. 
As you know,  two moles of sodium produce one mole of hydrogen which means we can already get maximum yield of hydrogen:  
[tex]2.84 / 2 = 1.42 moles. [/tex]
Since you have to get number of molecules you need to multiply the number of moles by the Avogadro's constant, and you will get : 

[tex]1.42 * 6.022 * 10^23 ~ 8.56 * 10^23[/tex]
Hope it will help you to solve the task.

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