Which is the balanced equation for V205 + Cas - CaO + V S.?

| 0 V2O6 + Cas-CaO + V S5

O 5V, 05 + 5CaS - 10CaO + 5V S5

O 3V, 05 + 3CaS - 3CaO + 3V S5

O V205 + 5CaS - 5CaO + V S5

What holds a covalent compound together? Is it an electrostatic attraction?

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How to calculate average concentration

Suppose that you measure a pen to be 10.5 cm long. Convert this to meters.