Question

name type here date type here
writing chemical formula & balancing chemical equations - slide 14
four coefficients will help balance this equation. drag the correct coefficients set / combination from the options provided below for balancing the equation and drop it in the box
al + hcl ------> alcl₃ + h₂
1, 6, 2, 1
3, 3, 2, 3
2, 4, 1, 3
2, 6, 2, 3
3, 2, 2, 1
5, 1, 2, 3
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Explanation:

Step1: Balance Al atoms

Count Al: left=1, right=1. Multiply left Al by 2, right $\text{AlCl}_3$ by 2:

$$2\text{Al} + \text{HCl} ightarrow 2\text{AlCl}_3 + \text{H}_2$$

Step2: Balance Cl atoms

Count Cl: right=6, left=1. Multiply $\text{HCl}$ by 6:

$$2\text{Al} + 6\text{HCl} ightarrow 2\text{AlCl}_3 + \text{H}_2$$

Step3: Balance H atoms

Count H: left=6, right=2. Multiply $\text{H}_2$ by 3:

$$2\text{Al} + 6\text{HCl} ightarrow 2\text{AlCl}_3 + 3\text{H}_2$$

Step4: Verify all atoms

Al: 2=2; Cl:6=6; H:6=6. Equation is balanced. Coefficients (Al, HCl, $\text{AlCl}_3$, $\text{H}_2$) are 2,6,2,3.

Answer:

2, 6, 2, 3