How many atoms in NH42Cr2O7?

Answer 1

To determine the number of atoms in the compound ammonium carbonate, (NH4)2CO3, we must be careful to remember that the little numbers (subscripts) are multipliers. Inside the parentheses, we have 1 nitrogen and 4 hydrogens, a total of 5, but the parentheses have a two multiplier, so we have two sets of NH4, a total of 10 atoms.

In the carbonate, there is 1 carbon and 3 oxygens, bringing our total number of atoms to 14.

Answer 2

A little correction first. The formula should be (NH4)2SO4.

It shows that there are 2 NH4 ions and each one has 4 hydrogens.

That looks like 8 hydrogen atoms to me.

Answer 3

19