QuestionJuly 22, 2025

Where is the law of conservation of mass not being followed?Select all that apply. S_(8(g))+Ag_((s))arrow 8AgS Mg_(3)N_(2(s))+3H_(2)O_((l))arrow NH_(3(g))+3Mg(OH)_(2(s)) 2NaCl+MgBr_(2)arrow 2NaBr+MgCl_(2) H_(2)SO_(4)+2NaOHarrow Na_(2)SO_(4)+2H_(2)O

Where is the law of conservation of mass not being followed?Select all that apply. S_(8(g))+Ag_((s))arrow 8AgS Mg_(3)N_(2(s))+3H_(2)O_((l))arrow NH_(3(g))+3Mg(OH)_(2(s)) 2NaCl+MgBr_(2)arrow 2NaBr+MgCl_(2) H_(2)SO_(4)+2NaOHarrow Na_(2)SO_(4)+2H_(2)O
Where is the law of conservation of mass not being followed?Select all that apply.
S_(8(g))+Ag_((s))arrow 8AgS
Mg_(3)N_(2(s))+3H_(2)O_((l))arrow NH_(3(g))+3Mg(OH)_(2(s))
2NaCl+MgBr_(2)arrow 2NaBr+MgCl_(2)
H_(2)SO_(4)+2NaOHarrow Na_(2)SO_(4)+2H_(2)O

Solution
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Answer

The law of conservation of mass is not followed in equations 1 and 2. Explanation 1. Check the first equation S_{8(g)} + Ag_{(s)} \rightarrow 8AgS: Compare atoms on both sides. Left has 8 S and 1 Ag; right has 8 Ag and 8 S. Not balanced. 2. Check the second equation Mg_{3}N_{2(s)} + 3H_{2}O_{(l)} \rightarrow NH_{3(g)} + 3Mg(OH)_{2(s)}: Left has 3 Mg, 2 N, 6 H, 3 O; right has 3 Mg, 1 N, 9 H, 6 O. Not balanced. 3. Check the third equation 2NaCl + MgBr_{2} \rightarrow 2NaBr + MgCl_{2}: Left has 2 Na, 2 Cl, 1 Mg, 2 Br; right has 2 Na, 2 Br, 1 Mg, 2 Cl. Balanced. 4. Check the fourth equation H_{2}SO_{4} + 2NaOH \rightarrow Na_{2}SO_{4} + 2H_{2}O: Left has 2 H, 1 S, 4 O, 2 Na, 2 O; right has 2 Na, 1 S, 4 O, 2 H, 2 O. Balanced.

Explanation

1. Check the first equation<br /> $S_{8(g)} + Ag_{(s)} \rightarrow 8AgS$: Compare atoms on both sides. Left has 8 S and 1 Ag; right has 8 Ag and 8 S. Not balanced.<br />2. Check the second equation<br /> $Mg_{3}N_{2(s)} + 3H_{2}O_{(l)} \rightarrow NH_{3(g)} + 3Mg(OH)_{2(s)}$: Left has 3 Mg, 2 N, 6 H, 3 O; right has 3 Mg, 1 N, 9 H, 6 O. Not balanced.<br />3. Check the third equation<br /> $2NaCl + MgBr_{2} \rightarrow 2NaBr + MgCl_{2}$: Left has 2 Na, 2 Cl, 1 Mg, 2 Br; right has 2 Na, 2 Br, 1 Mg, 2 Cl. Balanced.<br />4. Check the fourth equation<br /> $H_{2}SO_{4} + 2NaOH \rightarrow Na_{2}SO_{4} + 2H_{2}O$: Left has 2 H, 1 S, 4 O, 2 Na, 2 O; right has 2 Na, 1 S, 4 O, 2 H, 2 O. Balanced.
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