What coefficients must be added to balance the following reaction __Sn+___H3PO4___=H2+___Sn3 (PO4) 4

Answer 3Sn + 4H3pO4 = 6H2+Sn (PO) 4

1 Sn 3 Sn

3 H 2 H

1 P 4 P

4 O 16 O

then you have to make the numbers the same for each side

so you get by putting the 3 infront of Sn 4 infront of the H3PO4 and 6 infront of the H2

3 Sn 3 Sn

12 H 12 H

4 P 4 P

16 O 16 O