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Clarification on Mole ratio regarding physical states

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Clarification on Mole ratio regarding physical states

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5C (s) + 2So2 (g) -> CS2 (s) + 4CO (g)

For this equation, can the Mole ratio be 5C (s) : 4CO (g)? Must mole ratios be solid:solid and gas:gas

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Why is n= 2 and not 1?

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when a hydrocarbon is burned in excess oxygen, it produces carbon dioxide and water (vapour). Then why did all the videos so far on combustion(determining the formula of hydrocarbon) ignored the amount and valume of water.

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I was reading the notes and on page 20, for the complexing reactions titration, it says that it “involves the reaction between a metal ion and ligand to form a complex.”

What is the definition of “ligand” and “complex”?

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hello, can i check which area did i go wrong, my answer seems totally off from the actual ans :-(

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When the question asks us to write a balanced chemical equation, do we need to include the state symbols? How would we know when do we have to write state symbols and when we do not when writing a balanced chemical equation?

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i followed the method stated in the lectures, but my number for the pure substance seems to be very off, as the pure substance mass should not be more than the mass of the impure substance. Where did I go wrong?

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Confused on how come the answer I've gotten of 0.0336mol does not match the suggested answer of 0.0223mol for question 9a)

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How to determine the state of a salt product from a reaction? Is it based on the solubility of salts?

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How do I link and determine final mole ratio across 3 equations

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Confused about page 8 conversion of unit volume 

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Confused about page 8 conversion of unit volume 

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How do I derive the conversion of unit volume for the two circled ones . Thanks

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For Eg.2b) I don’t understand how to get the chemical equation

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I don't understand what the mol ratio stands for in part b. What does that mol ratio stand for? Is it na2co3 Vs H2O or something else?

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