3 years ago

The value of the metal in 2p coins, made in 1991 is now worth 3.3p.

Chemistry

1 answer:

Studentka2010 [4]3 years ago

8 0

The coins in 1991 had more copper in them compared to the coins today. So, that is why it worth 3.3p.

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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 :

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

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3 years ago

In experiment 1, how many moles of benzoic acid are present? how many moles of sodium bicarbonate are contained in 1 ml of a 10%

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