The balanced chemical equation below shows the reaction between nitrogen (N2) and hydrogen (H) to form ammonia (HN3) N2 + 3H2 - 2NH3
If 10.0 grams of nitrogen reacts with hydrogen to form 12.0 grams of ammonia, then how many grams of hydrogen were used in this reaction?
10 g of H2
A
B
3.0 g of H2
С
12 g of H2
D
2.0 g of H2

How do we find the answer?

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

Idon't see the pic?