Question

1.05 - test review - counting atoms
+ 3h₂ → 2nh₃
coefficient
subscript
the big number in front of a chemical formula is called a coefficient. this number tells you the amount of ______ there are.
○ atoms
○ molecules
○ subscript
○ cannot be determined

Explanation:

In a chemical formula, the coefficient (the big number in front) represents the number of molecules (or formula units) of that substance. For example, in \(3\text{H}_2\), the coefficient 3 means there are 3 molecules of hydrogen gas. Subscripts (like the 2 in \(\text{H}_2\) or 3 in \(\text{NH}_3\)) represent the number of atoms of an element in a single molecule. So the coefficient tells the amount of molecules.

Answer:

B. Molecules