elena makes the table below to determine the number of atoms of each element in the chemical formula…

elena makes the table below to determine the number of atoms of each element in the chemical formula 3(nh4)2so4.\n|element|calculation|total atoms|\n|--|--|--|\n|nitrogen|1×2×3|6|\n|hydrogen|4×2×3|24|\n|sulfur|1×4×3|12|\n|oxygen|4×3|12|\nwhat mistake did elena make?\nshe should not have multiplied the sulfur atoms by the subscript 4.\nshe should not have multiplied the nitrogen atoms by the subscript 2.\nshe should not have multiplied the oxygen atoms by the coefficient 3.\nshe should not have multiplied the hydrogen atoms by the coefficient 3.

elena makes the table below to determine the number of atoms of each element in the chemical formula 3(nh4)2so4.\n|element|calculation|total atoms|\n|--|--|--|\n|nitrogen|1×2×3|6|\n|hydrogen|4×2×3|24|\n|sulfur|1×4×3|12|\n|oxygen|4×3|12|\nwhat mistake did elena make?\nshe should not have multiplied the sulfur atoms by the subscript 4.\nshe should not have multiplied the nitrogen atoms by the subscript 2.\nshe should not have multiplied the oxygen atoms by the coefficient 3.\nshe should not have multiplied the hydrogen atoms by the coefficient 3.

Answer

Answer:

She should not have multiplied the sulfur atoms by the subscript 4.

Explanation:

Step1: Analyze chemical formula

The formula is $3(NH_4)_2SO_4$.

Step2: Determine sulfur - atom count

In $SO_4$, the subscript 4 is for oxygen. Sulfur has no sub - script directly attached to it in $SO_4$, and there is 1 sulfur atom in $SO_4$. With a coefficient of 3 in front of the whole formula, the number of sulfur atoms is $1\times3 = 3$, not $1\times4\times3$. So Elena's mistake was multiplying sulfur atoms by the subscript 4.