What are the formula for the compounds

Question

1. nickel (||) sulfate

2. silicon dioxide

3. iron(|||) sulfate

4. mercury (|) iodate

5. tin (|V) chloride

6. phosphorus pentabromide

7. hypochlorous acid

Answer 1

1. NiSO4

2. SiO2

3. Fe2(SO4)3

4. HgIO3

5. SnCl4

6. PBr5

7. HClO

Answer 2

1. nickel (||) sulfate..................... NiSO4

2. silicon dioxide.........................SiO2

3. iron(|||) sulfate.........................Fe2(SO4)...

4. mercury (|) iodate....................HgI

5. tin (|V) chloride.......................SnCl4.

6. phosphorus pentabromide........PBr5

7. hypochlorous acid...................HClO

Answer 3

Look at a periodic table and figure it out. Its simple analysis and theres not much maths involved in figuring that out.