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25 votes
For the reaction WNa+2H20->2NaOH+H2, how many grams of sodium are required to produce 50g NaOH?

User Joshkurz
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1 Answer

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19 votes

In this question, we have a stoichiometry question, and the first thing we need to do is to set up the properly balanced equation:

2 Na + 2 H2O -> 2 NaOH + H2

As we can see, the molar ratio of NaOH and Na is 2:2, so we are going to need the same number of moles of Na to produce the same number of moles of NaOH, now we need to find how many moles of NaOH we have in 50 grams, we are going to use its molar mass = 40g/mol

40g = 1 mol

50g = x moles

x = 1.25 moles of NaOH

So if we have 1.25 moles of NaOH, we are also going to have 1.25 moles of Na as a reactant, and using the molar mass of Na = 23g/mol, we can find the final mass:

23g = 1 mol

x grams = 1.25 moles

x = 28.75 grams of Na are required to produce 50 grams of NaOH

User Senthil
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