2 years ago

Based on the molar masses. how can you tell that an equation is balanced

1 answer:

3 0

You can tell if each side of the equation has the same molar mass.

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Alisiya [41]

FeBr₃ ⇒ limiting reactant

mol NaBr = 1.428

<h3>Further explanation</h3>

Reaction

2FeBr₃ + 3Na₂S → Fe₂S₃ + 6NaBr

Limiting reactant⇒ smaller ratio (mol divide by coefficient reaction)

211 g of Iron (III) bromide(MW=295,56 g/mol), so mol FeBr₃ :

$\tt n=\dfrac{mass}{MW}\\\\n=\dfrac{211}{295,56}\\\\n=0.714$

186 g of Sodium sulfide(MW=78,0452 g/mol), so mol Na₂S :

$\tt n=\dfrac{186}{78.0452}=2.38$

Coefficient ratio from the equation FeBr₃ : Na₂S = 2 : 3, so mol ratio :

$\tt FeBr_3\div Na_2S=\dfrac{0.714}{2}\div \dfrac{2.38}{3}=0.357\div 0.793$

So FeBr₃ as a limiting reactant(smaller ratio)

mol NaBr based on limiting reactant (FeBr₃) :

$\tt \dfrac{6}{3}\times 0.714=1.428$

6 0

2 years ago

Llana [10]

There is 3 ways that an atom can be put together

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3 years ago

blondinia [14]

Paramecia have a micro nuclei and a macro nuclei.

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3 years ago

grandymaker [24]

3079.23 is what you get when you multiply the answers.

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3 years ago

seropon [69]

No hay suficiente informacion.

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3 years ago