Question

The following reaction is used to produce tungsten(VI)oxide: WS3(s) + O2(g) ¨ WO3(s) + SO2(g)
The WO3 is then heated and undergoes a decomposition reaction produce tungsten and oxygen gas. How many grams of tungsten could be produced if 39.27 grams of WS3 are used

Answers

You should first balance the equation given.

WS3(s) + O2(g) -> WO3(s) + SO2(g)

But you should see that one mole of WS3 must yield one mole of WO3.

You also have the decomposition of WO3

WO3 -> W + O2

Again one mole of WO3 yields one mole of W metal.

So calculate the number of moles of WS3 you are starting with from
39.27/(molar mass of WS3)

this is the same number of moles of W metal produced so mass produced

39.27x(molar mass of W)/(molar mass of WS3)

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