Binary compounds of alkali metals and hydrogen react with water to liberate hydrogen gas. the hydrogen gas from the reaction of a sample of sodium hydride 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 755 mmhg.
find the mass of h2 liberated and the mass of nah that reacted.

Explanation:

The reaction that takes place is

To find the mass of H₂ liberated we use PV=nRT:

Then we use the moles of H₂ formed by the reaction to calculate the moles of NaH that reacted, and finally the mass using its molecular weight:

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the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.