toothpastes have been incidence of dental cavities. Apply fluoride ions, F-, whi

Question

toothpastes have been incidence of dental cavities. Apply fluoride ions, F-, which replace OH-, in solid hydroxyapatite, Ca5(PO4)3(OH) in teeth. The resulting compound is fluorapatite, Ca5(PO4)3F(s). Given this information, do you think the equilibrium constant for the dissolution of fluorapatite is higher or lower than that of hydroxyapatite? Explain your reasoning. A chemist places 1 mol each of nitrogen, N2(g), and hydrogen, H2(g), in a sealed vessel. The reactants undergo a reversible reaction: N2(g) + 3H2(g) rightarrow 2NH3(g) Determine the amount of ammonia, NH3(g), that would form if x mol of hydrogen, H2(g), is consumed in the reaction. (7.2) An investigator gathers the data in Table 1 by carrying out the reaction represented by the following

Explanation / Answer

here 1 nitrogen atom will Combine with 3 hydrogen atom, buth both nitrogen and hydrogen are in equal ammount, i.e., 1 mol

so, 1 mol nitrogen will combine with 1/3 mol of hydrogen.

here hydrogen is the limiting factor.

mole of hydrogen cosumed = x

as 3 h2 is used to form 2 nh3

so number of moles of nh3 produced from x moles of h2 will be equal to

2x/3

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