Ammonia reacts with oxygen to produce nitric acid (hno3) and water. what mass of nitric acid, in grams, can be made from 405 g of ammonia? express the mass to three significant figures and include the appropriate units.

1501 g = 15.0 x 10² g (3 significant figures).

Explanation:

NH₃(g) + 2O₂(g) → HNO₃(aq) + H₂O(aq),

It is clear that 1.0 moles of NH₃ react with 2.0 moles of O₂ to produce 1.0 mole of HNO₃ and 1.0 moles of H₂O.

n = mass/molar mass = (405 g)/(17.0 g/mol) = 23.82 mol.

using cross multiplication:

1.0 mol of NH₃ produces → 1.0 mol of HNO₃.

∴ 23.82 mol of NH₃ produces → 23.82 mol of HNO₃.

mass = n * molar mass = (23.82 mol) * (63.01 g/mol) = 1501 g = 15.0 x 10² g (3 significant figures).

i do not get it   at all

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.