How many moles of molecules are in 198 g of hydrogen nitrate (HNO3)? Answer in units of mol
mol = grams/molar mass = ?
To calculate the number of moles of molecules in a given mass of a substance, you need to use the concept of molar mass. Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol).
To find the molar mass of hydrogen nitrate (HNO3), you can use the periodic table to find the atomic masses of each element in the formula HNO3.
The atomic mass of hydrogen (H) is approximately 1 g/mol.
The atomic mass of nitrogen (N) is approximately 14 g/mol.
The atomic mass of oxygen (O) is approximately 16 g/mol.
To calculate the molar mass of HNO3, you add up the atomic masses of hydrogen, nitrogen, and three oxygen atoms:
(1 * 1 g/mol) + (1 * 14 g/mol) + (3 * 16 g/mol) = 1 g/mol + 14 g/mol + 48 g/mol = 63 g/mol.
Therefore, the molar mass of HNO3 is 63 g/mol.
Now, we can use this molar mass to calculate the number of moles of molecules in 198 g of HNO3:
Number of moles = Mass (g) / Molar mass (g/mol)
= 198 g / 63 g/mol
= 3.143 mol (rounded to three decimal places).
So, there are approximately 3.143 moles of molecules in 198 g of hydrogen nitrate (HNO3).