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Amount of substance

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Question 66

Vanadium can be manufactured by heating vanadium(V) oxide, V2O5\text{V}_2\text{O}_5V2​O5​, with calcium at high temperatures:

V2O5+5Ca→2V+5CaO \text{V}_2\text{O}_5 + 5\text{Ca} \rightarrow 2\text{V} + 5\text{CaO} V2​O5​+5Ca→2V+5CaO

22.5 g of V2O5\text{V}_2\text{O}_5V2​O5​ is reacted with an excess of calcium. The percentage yield of vanadium is 76.0%.

What is the mass of vanadium obtained?

(Relative atomic masses, ArA_rAr​: V=50.9\text{V} = 50.9V=50.9, O=16.0\text{O} = 16.0O=16.0)

4.79 g4.79\text{ g}4.79 g

6.30 g6.30\text{ g}6.30 g

9.58 g9.58\text{ g}9.58 g

12.6 g12.6\text{ g}12.6 g

Amount of substance Questions

  1. A Level
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