How many grams of nitrogen would be contained in .025 moles of HNO3?

[(molar mass of N)^2 / (molar mass HNO3)] * .025

To determine the number of grams of nitrogen in a given amount of HNO3, we'll need to find the molar mass of nitrogen, which can be obtained from the periodic table. The molar mass of nitrogen (N) is approximately 14.01 grams per mole.

Next, we need to find the molar mass of HNO3, which is the sum of the atomic masses of hydrogen (H), nitrogen (N), and oxygen (O) in one molecule of HNO3. The atomic mass of hydrogen is approximately 1.01 grams per mole, and oxygen is approximately 16.00 grams per mole. So the molar mass of HNO3 is:

(1 * 1.01) + (1 * 14.01) + (3 * 16.00) = 63.02 grams per mole.

Now, we can use the given number of moles of HNO3 (.025 moles) and the molar mass of nitrogen (14.01 grams/mole) to calculate the grams of nitrogen in the given quantity of HNO3.

grams of nitrogen = (moles of HNO3) * (molar mass of nitrogen)

grams of nitrogen = (.025 moles) * (14.01 grams/mole)

grams of nitrogen = 0.35025 grams

Therefore, there would be approximately 0.35025 grams of nitrogen contained in 0.025 moles of HNO3.