First, we need to recognize the molecular framework of sulfur trioxide. Sulfur trioxide is written of one sulfur atom and three oxygen atoms, offering it a molecule formula that SO3.

You are watching: What is the molar mass of sulfur trioxide

Let"s now identify the molar fixed of sulfur trioxide, i m sorry we can use to convert from mol to grams. Sulfur has actually a molar fixed of 32.06 g/mol and oxygen has a molar fixed of 15.999 g/mol. To uncover the molar massive of this molecule we need to add up these weights. We have three oxygen molecules so us multiply the molar fixed of oxygen by three and include it to the molar mass of sulfur to obtain a total molar mass of 80.057 g/mol < 3(15.999) + 1(32.06) = 80.057 >.

Now that we have the molar fixed of the molecule we can convert kmol to mol and also then usage the molar mass we calculated to convert mol come grams.

1 kmol = 1000 mol

1.57 kmol = 1570 mol

1570 mol x 80.057 g / 1 mol = 125,689 grams sulfur trioxide


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J.R. S.


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You have to multiply 1570 moles by molar mass, not divide. It need to be 1570 moles x 80.057 g/mol = 125,689 g
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