Write the stoichiometric coefficient for the following reactionx→2, y→1, z→2x→2, y→2, z→1x→1, y→2, z→2x→4, y→1, z→2

It seems like you're asking for the stoichiometric coefficients for several reactions. Stoichiometric coefficients are the numbers in front of atoms, ions, and molecules in a balanced chemical equation. They represent the relative amounts of substances involved in the reaction.

1. For the reaction x→2, y→1, z→2, the stoichiometric coefficients are 2 for x, 1 for y, and 2 for z.

2. For the reaction x→2, y→2, z→1, the stoichiometric coefficients are 2 for x, 2 for y, and 1 for z.

3. For the reaction x→1, y→2, z→2, the stoichiometric coefficients are 1 for x, 2 for y, and 2 for z.

4. For the reaction x→4, y→1, z→2, the stoichiometric coefficients are 4 for x, 1 for y, and 2 for z.