How did you derive the formula of tetraphosphorus?

Answer 1

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Questions & Answers

CBSE

Chemistry

Grade 12

Some useful inorganic compound...

Answer

What is the correct formula for tetraphosphorus tribromide?

A) ${P_2}B{r_5}$

B) ${P_3}B{r_4}$

C) ${P_5}B{r_2}$

D) ${P_4}B{r_3}$

Answer

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Hint: To find the chemical formula of tetraphosphorus tribromide, you need to go accordingly with the name. Tetra is used for the number 4 and tri is used for 3. Tetraphosphorus tribromide contains phosphorus atoms and bromine atoms.

Complete Solution :

Tetraphosphorus tribromide is an inorganic compound containing two different atoms that is, phosphorus and bromine. Let us break the name of tetraphosphorus tribromide. Tetra means four, therefore according to the name, it contains four phosphorus atoms and tri means three, thus it contains three bromine atoms. Chemical symbol for phosphorus is P and the chemical symbol for bromine atoms is Br. Hence, the chemical formula for tetraphosphorus tribromide is ${P_4}B{r_3}$.

• The balanced chemical equation for the formation of tetraphosphorus tribromide (${P_4}B{r_3}$) is:

$2{P_4} + 3B{r_2} \to 2{P_4}B{r_3}$

• Two moles of tetraphosphorus molecules combine with three moles of bromine molecules to form two moles of tetraphosphorus tri bromides.