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Chapter 2: Problem 42

What are the empirical formulas of the following compounds? (a) \(\mathrm{Al}_{2} \mathrm{Br}_{6},\) (b) \(\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{4},\) (c) \(\mathrm{N}_{2} \mathrm{O}_{5}\) (d) \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\)

Short Answer

Expert verified
The empirical formulas are (a) \(\mathrm{AlBr}_{3}\), (b) \(\mathrm{NaSO}_{2}\), (c) \(\mathrm{N}_{2} \mathrm{O}_{5}\), and (d) \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\).

Step by step solution

01

Determine the Empirical Formula of Al₂Br₆

In the formula \(\mathrm{Al}_{2} \mathrm{Br}_{6}\), both the subscript of Al and Br can be divided by 2. That will give us \(\mathrm{AlBr}_{3}\). So, the empirical formula for \(\mathrm{Al}_{2} \mathrm{Br}_{6}\) is \(\mathrm{AlBr}_{3}\).
02

Determine the Empirical Formula of Na₂S₂O₄

In the formula \(\mathrm{Na}_{2} \mathrm{S}_{2} \mathrm{O}_{4}\), the subscripts of Na, S, and O can be divided by 2. That will give us \(\mathrm{NaSO}_{2}\). So, the empirical formula for \(\mathrm{Na}_{2} \mathrm{S}_{2} \mathrm{O}_{4}\) is \(\mathrm{NaSO}_{2}\).
03

Determine the Empirical Formula of N₂O₅

In the formula \(\mathrm{N}_{2} \mathrm{O}_{5}\), the subscript of N and O cannot be simplified any further. So, the empirical formula for \(\mathrm{N}_{2} \mathrm{O}_{5}\) is \(\mathrm{N}_{2} \mathrm{O}_{5}\).
04

Determine the Empirical Formula of K₂Cr₂O₇

In the formula \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\), the subscripts of K, Cr, and O cannot be simplified any further. So, the empirical formula for \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) is \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\).

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Most popular questions from this chapter

Consult a handbook of chemical and physical data (ask your instructor where you can locate a copy of the handbook) to find (a) two metals less dense than water, (b) two metals more dense than mercury, (c) the densest known solid metallic element, (d) the densest known solid nonmetallic element.

What are allotropes? Give an example. How are allotropes different from isotopes?

Give two examples of each of the following: (a) a diatomic molecule containing atoms of the same element, (b) a diatomic molecule containing atoms of different elements, (c) a polyatomic molecule containing atoms of the same element, (d) a polyatomic molecule containing atoms of different elements.

Draw two different structural formulas based on the molecular formula \(\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}\). Is the fact that you can have more than one compound with the same molecular formula consistent with Dalton's atomic theory?

The elements in Group \(8 \mathrm{~A}\) of the periodic table are called noble gases. Can you guess the meaning of "noble" in this context?
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