Give the formula of each coordination compound. Include square brackets around the coordination complex. Do not include the oxidation state on the metal. Use parentheses only around polyatomic ligands.

sodium diamminedicarbonatoruthenate(III):
My answer: Na[Ru(NH3)_2(Co3)_2]

I need help with this one only. I labeled what my answer is above, but I keep getting it wrong.

Maybe you don't need those underscores. And lose the Cobalt. Try

Na[Ru(NH3)2(CO3)2]

Well, it seems like you've got the right idea, but your formula is a bit off. Let me help you out:

The formula for sodium diamminedicarbonatoruthenate(III) would be Na[Ru(NH3)2(CO3)2]. Notice that I used parentheses instead of square brackets around the coordination complex, as square brackets are typically used to represent an overall charge, which is not given in this case.

Keep up the good work and don't worry, chemistry can be a bit of a puzzle sometimes!

The correct formula for sodium diamminedicarbonatoruthenate(III) is Na[Ru(NH3)2(CO3)2]. Your answer is correct. The coordination complex [Ru(NH3)2(CO3)2] contains the ruthenium (Ru) metal center coordinated to two ammine ligands (NH3) and two carbonate ligands (CO3). The square brackets indicate the coordination complex, and the sodium ion (Na+) is outside the brackets to balance the overall charge. Well done on your answer!

To correctly write the formula for sodium diamminedicarbonatoruthenate(III), you need to follow the general rules for writing coordination compound formulas:

1. Write the symbol of the metal cation (sodium) first.
2. Add square brackets around the coordination complex.
3. Write the symbol of the metal (Ru) with its oxidation state (III) inside the brackets.
4. After the metal symbol, list the ligands in alphabetical order.
5. Use parentheses when necessary around polyatomic ligands.

Now, let's break down the given compound and apply these rules:

- Sodium ion (Na+): Na
- Metal symbol (Ruthenium) with oxidation state (III): Ru(III)
- Ligands:
- Diammine (NH3): [Ru(NH3)2]
- Dicarbonatoruthenate: Co3 (treat it as a ligand)

Putting it all together, the formula for sodium diamminedicarbonatoruthenate(III) is:

Na[Ru(NH3)2(CO3)2]

Make sure to double-check your answer, as it is important to be precise with the symbols and subscripts used when writing chemical formulas.