takeAssignment/takeCovalentActivity.do?locator assignment onLocatorsa r assignme

Question

takeAssignment/takeCovalentActivity.do?locator assignment onLocatorsa r assignment-take ?1? ignificant FiguresUS WomenClothingHow to Wirite a Com a Cambridge Internat Womens Eyeglaesses AR Home Order Receipt l Use the References to access important valors if needed for this question h aqueous sedium hydrexide to produce hydrogen gas according to the following equation The prodact gas. H, is collected over water at a temperature of 25 "C and a pressare of 759 mm Hg If the wet H, gas formed occupies a Aluminum reacts wit volurme of 9.63 L, the mamber of grams of H, formed is g The vapor pressure of water is 23.8 mm Hg at 25 °C Suit ARSW Retry Entire Groap more group attempts remaining

Explanation / Answer

2Al(s) + 2NaOH(aq) + 6H2O(l) ---------------> 2NaAl(OH)4(aq) + 3H2(g)

total pressure   = 759mmHg

The vapor pressure of water = 23.8mmHg

The pressure of H2   = total pressure - The vapor pressure of water

                                 = 759-23.8   = 735.2mmHg

P    = 735.2/760    = 0.9674atm

V   = 9.63L

T    = 25+273 = 298K

PV   = nRT

n    = PV/RT

       = 0.9674*9.63/0.0821*298   = 0.38 moles of H2

mass of H2 = no of moles * gram molar mass

                    = 0.38*2   = 0.76g >>>>>answer

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