Final answer:
The mass of one molecule of HNO₃ is approximately 1.05 × 10⁻²³ grams.
Step-by-step explanation:
The mass of one molecule of HNO₃ can be determined using the molar mass of HNO₃. The molar mass of HNO₃ is the sum of the atomic masses of its constituent atoms. The atomic masses of hydrogen, nitrogen, and oxygen are approximately 1.01 g/mol, 14.01 g/mol, and 16.00 g/mol, respectively. Summing these atomic masses gives a molar mass of approximately 63.01 g/mol for HNO₃. Since one mole of any substance contains Avogadro's number of molecules, which is approximately 6.022 × 10²³ molecules/mol, we can calculate the mass of one molecule of HNO₃ by dividing the molar mass by Avogadro's number.
Using the given molar mass of HNO₃, 63.01 g/mol, and Avogadro's number, 6.022 × 10²³ molecules/mol, we can calculate the mass of one molecule as follows:
Mass of one molecule of HNO₃ = (63.01 g/mol) / (6.022 × 10²³ molecules/mol).
Calculating this expression gives a mass of approximately 1.05 × 10⁻²³ grams per molecule of HNO₃, when rounded to two decimal places in scientific notation.