first, we need the molar mass of HNO3(azotic acid) it's equal to 1AH+1AN+3AO(where A is the atomic mass of the element present within the molecule and, it's multiplied by how many times it's present)=1*1+1*14+3*16=15+54=69g/mole
now we multiply the molar mass with the number of moles 69*1.2=82.8 grames
