Answer:
The answer to your question is a) N₂     b) 3.04 g of NH₃
Explanation:
Data
mass of H₂ = 2.5 g
mass of N₂ = 2.5 g
molar mass H₂ = 2.02 g
molar mass of N₂ = 28.02 g
molar mass of NH₃ = 17.04 g
Balanced chemical reaction
                 3H₂  +  1 N₂   ⇒   2NH₃
A) 
Calculate the theoretical yield 3H₂ / N₂ = 3(2.02) / 28.02 = 0.22
Calculate the experimental yield H₂/N₂ = 2.5/2.5 = 1
Conclusion 
The limiting reactant is N₂ (nitrogen) because the experimental proportion was higher than the theoretical proportion. 
B) 
              28.02 g of N₂ -------------------- (2 x 17.04) g of NH₃
                2.5 g of N₂    --------------------   x
                             x = (2.5 x 2 x 17.04) / 28.02
                             x = 85.2 / 28.02
                             x = 3.04 g of NH₃
 
        
             
        
        
        
Explanation:
RAM={mass number ×relative abundance (%) + mass number ×relative abundance (%)} ÷100%
so take (91.05×20) +(8.95×22)
 
        
             
        
        
        
Answer:
Condensation: 423.3 K
Freezing: 83.96 K
(this is all i could figure out :) hope it helps)
 
        
             
        
        
        
Answer:
(B). it's metallic bonding