Write the balanced equation for the following by inserting the correct coefficients in the blanks.
___ Al₄C₃ (s) + ___ H₂O (l) → ___ Al₂O₃ (s) + ___ CH₄ (g)

Determine the total sum of the coefficients after balancing the following equation.

___ C₂H₅SH (g) + ___ O₂ (g) → ___ CO₂ (g) + ___ H₂O (l) + ___ SO₂ (g)

___ Ba(OH)₂ + ___ H₃PO₄ → ___ H₂O + ___ Ba₃(PO₄)₂

___NaOH (aq) + ___ H₃PO₄(aq) → ___ H₂O(l) + ___ Na₃PO₄(aq)

Determine the balanced chemical equation when ethanol, C₂H₆O is ignited in the presence of air.

The reaction between reactant A (blue spheres) and reactant B (red spheres) is shown in the following diagram:

Based on this diagram, which equation best describes the reaction? (a) A2 + B¡A2B (b) A2 + 4 B¡2 AB2 (c) 2 A + B4¡2 AB2 (d) A + B2¡AB2