Question

Binary compounds of alkali metals and hydrogen react with water to liberate H2(g). The H2 from the reaction of a sample of NaH with an excess of water fills a volume of 0.475 L above the water. The temperature of the gas is 35 ∘C and the total pressure is 765 mmHg. Part A- Find the mass of H2 liberated Part B- Find the mass of NaH that reacted.

          Binary compounds of alkali metals and hydrogen react with water
to liberate H2(g). The H2 from the reaction of a sample of NaH with
an excess of water fills a volume of 0.475 L above the water. The
temperature of the gas is 35 ∘C and the total pressure is 765 mmHg.
Part A- Find the mass of H2 liberated Part B- Find the mass of NaH
that reacted.
        
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Chemistry: Structure and Properties
Chemistry: Structure and Properties
Nivaldo Tro 2nd Edition
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Binary compounds of alkali metals and hydrogen react with water to liberate H2(g). The H2 from the reaction of a sample of NaH with an excess of water fills a volume of 0.475 L above the water. The temperature of the gas is 35 ∘C and the total pressure is 765 mmHg. Part A- Find the mass of H2 liberated Part B- Find the mass of NaH that reacted.
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Transcript

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00:01 Hi now we will discuss about the reaction between the alkali metals and water it produces the hydrogen gas in the reaction yet the volume of the hydrogen gas produced is 0 .475 liters and the temperature is 35 degrees centigrade volume of hydrogen gas is collected over the water layer so the vapor pressure of the water at 35 degrees centigrade is taken as 31 .82 mm of hg from this information we have to find the what mass of hydrogen is collected in the container so for this first we have to find the pressure of the hydrogen gas we can find the pressure of the hydrogen gas by using the equation you know that p total that is total pressure is equal to the sum of the partial pressures of the all the constituents present in that here we have the hydrogen gas here we have the hydrogen gas and paper pressure of water is also exiting so pressure of water pressure of water first we have to find the p hydrogen pressure of hydrogen is equal to p total minus vapor pressure of water or partial pressure of water by substituting the values in this equation here we have given that the total pressure is 765 mm of hg is given it is given that 765 mhm hg minus p h2o is 31 .82 by subtracting this we'll get 733 .18 mhm hg this is the pressure of the hydrogen gas now we have to convert this value into atmospheric pressure we know that one atmospheric pressure is equal to 760 m of hg 733 .1 m m of hg if we convert into atmosphere it should be divide with the 760 m of hg 733 .m of hg if…
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