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 16.91 grams of WS3 are used?

How would i work this out i'm confused. thanks

It would help if you told us what was confusing you. You have two equations. Balance them.

2WS3 + 9O2 ==> 2WO3 + 6SO2
2WO3 ==> 2W + 3O2

Here is the procedure for working stoichiometry problems. This will work all of them for you so print this out and save it.
1. Convert grams starting material to moles. moles = grams/molar mass.

2. You have moles WS3. You want to convert that to moles W. Use the coefficients in the balanced equation. Use the first equation to convert to mole WO3 and the second to convert to moles W.
?moles WS3 x (2 moles WO3/2 moles WS3) x (2 moles W/2 moles WO3). All of this becomes ?moles WS3 x (2/2)(2/2) = ?moles W.
3. Now convert moles W to grams W.
grams W = moles W x atomic mass W.
(Note: most problems don't have a two step synthesis of the desired product and they use only one set of conversions from starting material to end product and you COULD have worked two problems here. The first one would convert from grams WS3 to grams WO3 and the second problem would convert from grams WO3 to grams W but it is easier to convert both at the same time and it saves a couple of steps.). Post your work if you get stuck or post for an explanation about any of the steps.

thank you I get it now

To determine the grams of tungsten produced in this reaction, we need to follow a few steps:

Step 1: Convert the given mass of WS3 (16.91 grams) to moles.
To do this, we need to know the molar mass of WS3. The molar mass of tungsten is 183.85 g/mol, and the molar mass of sulfur is 32.07 g/mol. Therefore, the molar mass of WS3 is:
(3 * molar mass of tungsten) + (1 * molar mass of sulfur) = 3 * 183.85 g/mol + 32.07 g/mol = 683.47 g/mol

To determine the number of moles of WS3, divide the given mass by the molar mass:
moles = mass / molar mass = 16.91 g / 683.47 g/mol

Step 2: Use the balanced chemical equation to determine the mole ratio of WS3 to WO3 and WO3 to W. From the given reaction:
WS3(s) + O2(g) → WO3(s) + SO2(g)

The coefficients in the balanced equation indicate the mole ratio between reactants and products. For this equation, the mole ratio between WS3 and WO3 is 1:1, and the mole ratio between WO3 and W is also 1:1.

Step 3: Multiply the moles of WS3 by the mole ratio of WS3 to W to obtain moles of W.
moles of W = moles of WS3 * (1 mole of W / 1 mole of WS3)

Step 4: Convert moles of W to grams of W.
To do this, we need to know the molar mass of tungsten (W), which is 183.85 g/mol.
mass of W = moles of W * molar mass of W

Now you can plug in the values and calculate the mass of tungsten produced.

Note: Make sure to use proper significant figures and round your final answer to an appropriate number of decimal places.