What is the total number of nitrogen atoms in two mol of NH4NO3 ?

2.409 x 10²⁴

Explanation:

There are two nitrogens for every mole of NH₄NO₃

Since there are two moles, that means there are 4 nitrogens

There are 6.022 x 10²³ atoms in every mole of any element

(6.022 x 10²³) x 4 = 2.4088 x 10²⁴

Use sig figs to round it to 2.409 x 10²⁴

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.