Which of the following pairs of phase changes is exothermic? melting and freezin

Question

Which of the following pairs of phase changes is exothermic? melting and freezing vaporization and melting sublimation and condensation deposition and vaporization freezing and condensation Consider the following unbalanced equation: NH_3(g) + O_2 (g) rightarrow NO(g) + H_2O(l). 12.0 g of NH_3 reacted with 12.0 g of O_2 to produce 6.50 g of H_2O. What is the percent yield of the reaction? 98.0 % 47.2 % 51.4% 80.2% 39.6% Which of the following are true regarding Na_2CO_3? W. It is a molecular compound. It has both ionic and covalent bonds. It dissociates 100% in aqueous solution. W only W and Y only X and Y only All of them. None of them. Calculate the frequency of light emitted when the transition n = 6 rightarrow n = 3 occurs in the hydrogen atom. 2.74 times 10^14 s^-1 1.52 times 10^14 s^-1

Explanation / Answer

Generally a molecular compound consist of two or more nonmetals. It exixst as a discrete unit of atoms.

but in case of sodium carbonate it dissociates as sodium ion (Na+) and carbonate, here sodium is ion and carbonate

( CO3-) is nonmetal, hence sodium carbonate is ionic compound and not molecular compound

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