In the given chemical equation, What is the missing coefficient to balance the equation?___ H3PO3 → 3 H3PO4 +  1 PH3

To balance the given chemical equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation.

The equation is: ___ H3PO3 → 3 H3PO4 + 1 PH3

Step 1: Count the atoms on both sides of the equation.

On the left side, we have:

• H atoms: 3x
• P atoms: 1x
• O atoms: 3x

On the right side, we have:

• H atoms: (3x3) + 3 = 12
• P atoms: 3 + 1 = 4
• O atoms: 3x4 = 12

Step 2: Balance the atoms that appear in the most compounds first, usually Hydrogen or Oxygen. In this case, we'll start with Hydrogen.

To balance the Hydrogen atoms, we need to multiply H3PO3 by 4 on the left side of the equation. This gives us 12 Hydrogen atoms, which matches the right side.

Step 3: Now, let's balance the Phosphorus atoms.

By multiplying H3PO3 by 4, we also get 4 Phosphorus atoms on the left side, which matches the right side.

Step 4: Finally, let's balance the Oxygen atoms.

Multiplying H3PO3 by 4 also gives us 12 Oxygen atoms on the left side, which matches the right side.

So, the balanced equation is: 4 H3PO3 → 3 H3PO4 + 1 PH3

Therefore, the missing coefficient to balance the equation is 4.