Question

compare the total mass of the reactants to the total mass of the products. what choice demonstrates the law of conservation of mass? 12 g cl₂ + 13 g k → 25 g kcl 33 n₂ + 28 o₂ + 19 h₂o → 92 nh₄no₃ 48 g nacl → 12 g na + 35 g cl₂ 2 g h₂ + 71 g cl₂ → 91 g hcl

Explanation:

Step1: Calculate reactant mass (Option1)

$12\ \text{g} + 13\ \text{g} = 25\ \text{g}$

Step2: Compare to product mass (Option1)

$25\ \text{g} = 25\ \text{g}$

Step3: Calculate reactant mass (Option2)

$33\ \text{g} + 28\ \text{g} + 19\ \text{g} = 80\ \text{g}$

Step4: Compare to product mass (Option2)

$80\ \text{g}
eq 92\ \text{g}$

Step5: Calculate reactant mass (Option3)

$48\ \text{g}$

Step6: Compare to product mass (Option3)

$12\ \text{g} + 35\ \text{g} = 47\ \text{g}; 48\ \text{g}
eq 47\ \text{g}$

Step7: Calculate reactant mass (Option4)

$2\ \text{g} + 71\ \text{g} = 73\ \text{g}$

Step8: Compare to product mass (Option4)

$73\ \text{g}
eq 91\ \text{g}$

Answer:

A. $12\ \text{g}\ \text{Cl}_2 + 13\ \text{g}\ \text{K}
ightarrow 25\ \text{g}\ \text{KCl}$