The equilibrium-constant of the reaction no2(g)+no3(g)⇌n2o5(g) is k=2.1×10−20. what can be said about this reaction? a. at equilibrium the concentration of products and reactants is about the same. b. at equilibrium the concentration of products is much greater than the concentration of reactants. c. at equilibrium the concentration of reactants is much greater than that of products. d. there are no reactants left over once the reaction reaches equilibrium.

Explanation:

NO₂ + NO₃ ⇌ N₂O₅; K = 2.1 × 10⁻²⁰

We often write K as

If K is large, more of the molecules exist as products.

If K is small, more of the molecules exist as reactants.

a. b., and d. are wrong. The concentration of reactants is greater.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer