Elena makes the table below to determine the number of atoms of each element in the chemical formula 3(NH4)2SO4. What mistake did Elena make?
She should not have multiplied the sulfur atoms by the subscript 4.
She should not have multiplied the nitrogen atoms by the subscript 2.
She should not have multiplied the oxygen atoms by the coefficient 3.
She should not have multiplied the hydrogen atoms by the coefficient 3.