What mass of nitrogen gas is required to react completely with 2.79 g of hydroge

Question

What mass of nitrogen gas is required to react completely with 2.79 g of hydrogen gas to produce ammonia? The unbalanced chemical equation is: N_2 (g) + H_2 (g) rightarrow NH_3 (g) A) 25.8 g B) 38.7 g C) 78.2 g D) 12.9 g E) 77.4 g Which is the net ionic equation for the reaction between aqueous solutions of lithium hydroxide and hydrobromic acid? LiOH(aq) + HBr(aq) rightarrow H_2 O(l) + LiBr(aq) A) HBr(aq) rightarrow H^+(aq) + Br^-(aq) B) LiOH(aq) rightarrow Li^+(aq) + OH^-(aq) C) Li^+(aq) + Br^-(aq) rightarrow LiBr(aq) D) H^+(aq) + OH^-(aq) rightarrow H_2 O(l) E) Li^+(aq) + OH^-(aq) + H^+(aq) + Br^-(aq) rightarrow H_2 O(l) + LiBr(aq) Which process defines how molecular compounds form ions upon dissolution? A) ionization B) dissolution C) composition D) decomposition E) division What is the oxidation number of Cr in Cr_2 O^2_7-? A) +6 B) -2 C) +7 D) -7 E) -12 A system initially has an internal energy U of 504J. It undergoes a process during which it releases l l l J of heat energy to the surroundings, and does work of 222 J. What is the final energy of the system, in J? A) 615 J B) 393 J C) 504 J D) 837 J E) 171 J

Explanation / Answer

1. N2 + H2 ---> NH3

Molar Mass of N = 14.0067g

Molar Mass of H = 1.00794g

So 2.014g of H2 reacts with 28.0134g of N2

So,2.79g of H2 reacts with = (28.0134/2.014)*2.79 = 38.7g of N2.Option B.

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