# What volume of dihydrogen gas will be generated by the action of excess hydrochloric acid on a #21*g# mass of zinc metal?

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A temperature of #13# #""^@C# , and a pressure of #704*mm*Hg# are specified...

A temperature of

##### 1 Answer

#### Answer:

To answer this question we need (i) to know that:

#### Explanation:

That is

And of course we need (ii) a stoichiometrically balanced equation:

So for each equiv metal, 1 equiv of dihydrogen gas results.

And thus, by the stoichiometry,

And so now, this is an Ideal Gas Equation, where we solve for volume:

You can do the math. I get an answer of approx.

See here for more on the use of mercury to measure moderate pressure.