Nitric acid is often manufactured from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming of natural gas, in a two-step process. In the first step, nitrogen and hydrogen react to form ammonia:

Explanation:

We can start with the reaction of hydrogen and nitrogen to produce ammonia, so:

When we balance the reaction we will obtain:

Now, the production of nitric acid with oxygen would be:

If we balance the reaction we will obtain:

Now, if we put the reactions together we will obtain:

We can multiply the second reaction by "2":

We have "" on both sides. In the first reaction is in the right in the second reaction is on the left. Therefore we can cancel out this compound and we will obtain:

On this reaction, we will have 2 nitrogen atoms on both sides, 6 hydrogen atoms on both sides, and 8 oxygen atoms on both sides. So, this would be the net reaction for the production of nitric acid.

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the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.