When balanced, which equations would have the coefficient 3 in front of any of the reactants? Check all that apply. A. AgBr + GaPO4 → Ag3PO4 +GaBr3 B. H2SO4 + B(OH)3 → B2(SO4)3 + H2O C. Fe + AgNO3 → Fe(NO3)2 + Ag D. C2H4O2 + O2 → CO2 +H2O A

The  answer to your question is Only A and B

Explanation:

Reactions

A.              3 AgBr  +   GaPO₄   →   Ag₃PO₄   +   GaBr₃

              Reactants            Elements         Products

                   3                           Ag                    3

                   3                           Br                     3

                   1                            Ga                    1

                   1                            P                       1

                   4                           O                      4

B.     3H₂SO₄     +   2B(OH)₃    →    B₂(SO₄)₃    +    6H₂O

             Reactants            Elements         Products

                 3                            S                      3

                  2                            B                      2

                 12                           H                     12

                 18                           O                     18                    

C.       Fe     +    2 AgNO₃    →    Fe(NO₃)₂    +   2 Ag

          Reactants            Elements         Products

                  1                         Fe                     1

                  2                        Ag                    2

                  2                        N                      2

                  6                        O                      6

D.          C₂H₄O₂    +    2O₂    →   2CO₂    +   2H₂O

          Reactants            Elements         Products

                 2                         C                      2

                 4                         H                      4

                 6                         O                     6    

In option A and B we have a reactant with coefficient 3 in front

Explanation:

A. AgBr + GaPO4 → Ag3PO4 +GaBr3

On the left side we have 1x Br (in AgBr), on the right side we have 3x Br (in GaBr3). To balance the amount of Br on both sides, we have to multiply AgBr (on the left side) by 3. Now we also have balanced the amount of Ag on both sides. The equation is balanced now.

3AgBr + GaPO4 → Ag3PO4 +GaBr3

B. H2SO4 + B(OH)3 → B2(SO4)3 + H2O

On the left side we have 1x S (in H2SO4) on the right side we have 3x S (inB2(SO4)3. To balance the amount of S on both sides, we have to multiply H2SO4, on the left side, by 3.

3H2SO4 + B(OH)3 → B2(SO4)3 + H2O

On the left side we have 6x H (in 3H2SO4) on the right side we have 1x H (in H2O). To balance the amount of H on both sides, we have to multiply H2O, on the right side, by6.

3H2SO4 + B(OH)3 → B2(SO4)3 + 6H2O

On the left side we have 1x B (in B(OH)3) on the right side we have 2x B (in B2(SO4)3). To balance the amount of B on both sides, we have to multiply B(OH)3, on the leftt side, by 2.

Now the equation is balanced.

3H2SO4 + 2B(OH)3 → B2(SO4)3 + 6H2O

C. Fe + AgNO3 → Fe(NO3)2 + Ag

On the left side we have 1x NO3 (in AgNO3), on the right side we have 2x NO3 (in Fe(NO3)2). To balance the amount of NO3 on both sides, we have to multiply AgNO3 (on the left side) by 2

Fe + 2AgNO3 → Fe(NO3)2 + Ag

On the left side we have 2x Ag (in 2AgNO3), on the right side we have 1x Ag . To balance the amount of Ag on both sides, we have to multiply Ag (on the right side) by 2

Fe + 2AgNO3 → Fe(NO3)2 + 2Ag

D. C2H4O2 + O2 → CO2 +H2O

On the left side we have 2x C (in C2H4O2), on the right side we have 1x C (in CO2) . To balance the amount of C on both sides, we have to multiply CO2 (on the right side) by 2

C2H4O2 + O2 → 2CO2 +H2O

On the left side we have 4x H (in C2H4O2), on the right side we have 2x H (in H2O) . To balance the amount of H on both sides, we have to multiply H2O (on the right side) by 2

C2H4O2 + O2 → 2CO2 + 2H2O

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