Chemistry: When balancing a chemical equation, which of the following are you allowed to do? Take away substances Add coefficients Change subscripts Add new substances

When balancing a chemical equation, which of the following

u8p4

24.02.2021

Add Coefficients

Explanation:

You CAN'T change the identity of an element or substance in an equation. You can only change coefficients.

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pinkmoonlight

18.11.2022

The empirical formula for this oxide : As₂O₃

Further explanation:

Given

mass of Arsenic=3.26 g

mass of Oxygen = 1.04 g

Required

The empirical formula

Analysis

find mole of elementsdetermine the ratio of each element

Solution

mol of Arsenic(MW=74,9216 u) :

$\tt mol=\dfrac{3.26}{74,9216}=0.0435$

mol of Oxygen(MW=15.999 u) :

$\tt mol=\dfrac{1.04}{15.999}=0.065$ .

The ratio for each element (divide by smaller mol⇒Arsenic)

Arsenic : Oxygen :

$\tt \dfrac{0.0435}{0.0435}\div \dfrac{0.065}{0.0435}=1\div 1.5\rightarrow 2\div 3$

The empirical formula : As₂O₃

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