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File Edit View History Bookmarks People Window Help art | Redbubble xChapter 10 Homework GA piece of sodium metal re x ezto.mheducation.com/hm.tpx value 10.00 points attempts left C Check my work Enter your answer in the provided box A piece of sodium metal reacts completely with water as follows: 2Na(s) + 2H2O() 2NaOH(aq) + H2 g) The hydrogen gas generated is collected over water at 23.0°C. The volume of the gas is 471 mL measured at 0.999 atm.Calculate the number of grams of sodium used in the reaction. (The vapor pressure of water at 23.0°C-0.0277 atm.) 891 Guia 4 5

Explanation / Answer

P(dry) of the H2 gas collected is P(total) - P(wet) = 0.999 atm - 0.0277 atm = 0.9713 atm.

PV=nRT

0.9713atm × 0.471L = n × 0.0821 L-atm/K × (23+273)K

0.9856 = n × 24.3016

n = 0.04 moles

It means, 0.04 moles of H2 is released.

Since, the given reaction is stoichiometric reaction, moles of Na required is double the number of moles of H2 produced.

Therefore, 0.08 moles of Na is required.

I.e., 0.08 × 23(MW of sodium) = 1.84 grams of sodium is required.

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