Atom economy Watch

scarbutterfly
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How come some websites/books say that atom economy is either:

mass of all desired products/mass of all products *100%
or
Mr of all desired products/Mr of all products *100%

What is the difference? Is one of them wrong? Which one should I be using for chemistry test papers? Are there different circumstances I have to apply them to?
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The A-level kid
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(Original post by scarbutterfly)
How come some websites/books say that atom economy is either:

mass of all desired products/mass of all products *100%
or
Mr of all desired products/Mr of all products *100%

What is the difference? Is one of them wrong? Which one should I be using for chemistry test papers? Are there different circumstances I have to apply them to?
It's the same thing. Mr stands for relative molecular mass which is the same as saying the mass of the products.
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ChemistryWebsite
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Mass.
Mr would only work if the same number of moles of each product is made. Mass works regardless of the molar ratio of products.
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