OO OO OCC OO CD In the diagram above the paired open spheres represent H2 molecu

Question

OO OO OCC OO CD In the diagram above the paired open spheres represent H2 molecules and the paired solid spheres represent N2 molecules. When the molecules in the box react to form the maximum possible amount of ammonia (NH30 molecules, what is the limiting reactant and how many molecules of NH3 can be formed? CA) N2 is limiting. 5 molecules of NH3 can be formed (B) N2 is limiting 10 molecules of NH3 can be formed (C) H2 is limiting. 8 molecules of NH3 can be formed (D) H2 is limiting. 12 molecules of NH3 can be formed 3. Vanillin, C8H8O3 (M 152 g/mol), is the molecule responsible for the vanilla flavor in food. How many elemental forms in nature? (A) neon, phosphorus, fluorine (B) helium, hydrogen, iodine (C) nitrogen, oxygen, sulfur (D) oxygen, chlorine, phosphorus 8. Which one of the following cannot act as an oxidizing agent? (A) s (B) SO3 (C) SOA (D) S2082 9. Which substance is the primary component in stalactites and stalagmites in caves? (A) Cao (B) CaCO3 (C) Ca(OH (D) CaSO4 10. Five successive determinations of the density of an alloy gave the following results 10.29 g/mL, 9.95 g/mL, 10.06 g/mL, 9.89 g/mL, 10.18 g/mL What value should be reported for the density of this alloy? (A) 10.074 g/mL (B) 10.07 0.16 g/mL

Explanation / Answer

N2 + 3H2 ----> 2NH3

5 mol N2

12 mol H2

1mol N2 ---- 3mol H2

x=4 molN2 ------ 12 mol H2 ---> N2 is in excess, H2 is the limiting reactant.

3 mol H2------2mol NH3

12 molH2 -----x = 8 mol NH3

So, the correct option is C

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