3 years ago

In which example is matter changing

Chemistry

1 answer:

just olya [345]3 years ago

6 0

A) heating a pan of water until the water is all gone because then it would change from a liquid top a gas.

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A sample of 211 g of iron (III) bromide is reacted with

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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)

FeBr₃

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

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

Na₂S

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

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

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So FeBr₃ as a limiting reactant(smaller ratio)

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