To calculate the formal charge of the nitrogen atom in HNO3, we need to follow these steps:1. Determine the number of valence electrons for nitrogen. Nitrogen is in group 15, so it has 5 valence electrons.2. Calculate the number of bonding electrons. In HNO3, nitrogen forms two single bonds with one hydrogen and one oxygen and one double bond with another oxygen . Each single bond has 2 electrons, and the double bond has 4 electrons. So, there are a total of 2 + 2 + 4 = 8 bonding electrons.3. Calculate the number of non-bonding electrons. Since nitrogen has 5 valence electrons and 8 bonding electrons, there are 5 - 8/2 = 5 - 4 = 1 non-bonding electron.4. Calculate the formal charge. The formal charge is the difference between the number of valence electrons and the sum of the bonding and non-bonding electrons. In this case, the formal charge of nitrogen in HNO3 is 5 - 8/2 + 1 = 5 - 4 + 1 = 5 - 5 = 0.So, the formal charge of the nitrogen atom in HNO3 is 0.