Enthalpy Stoichiometry Part 1: Finding Heat and Mass

We'll go over the main conversion factors you need for enthalpy stoichiometry, after this, you will find thermochemical equations a lot simpler! Plus I'll go over major keywords like heat absorbed or heat released and how they affect our enthalpy change.
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What about when you are not given an enthalpy and are only given the temperature change and the mass of water?

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what about when theres an excess?? For example my question is "Calculate how much energy is changed when 16 g of O2(g) reacts with excess ClF3(g)". How do I work in the excess amount? plz answer

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Tbh, i could not understand a thing in the calculation [ sorry in advance, if that sounded rude] is it me, or do you assume we know everything and you start us off with that ?

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How many kilojoules are given off when 17.8 mol of CH4(g) react? CH4(g) + 2O2(g) → CO2(g) + 2H2O(ℓ) ΔH = −890.1 kJ please this solve because I don't understand help me

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Thank you so much Hanna 💕

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Hi, why didn't you change the -1204kj into positive when it was above the 2 moles. I only ask this because I've seen other chemistry videos and they reverse the sign in the stoichiometry process

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is the answer for the last example letter b, 1340.35 kJ?

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[@melissamaribel]

You are so welcome! Happy you like all the stoich videos 😊

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Hey Shuat, so we never multiply the subscripts and the coefficient for balancing. The magnesium is the only one that has that 2 in front. I recommend reviewing some more balancing equations, I recommend these videos: Video 1: kzbin.info/www/bejne/oKqZd2OCl9udo5o Video 2: kzbin.info/www/bejne/hmGlhIegr86Jr9U

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