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CHEM 101 · Week 6
How many grams of CO2 form when 25.0 g of propane burns completely?

Balance the combustion, then convert mass to moles to mass:

C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
25.0 g ÷ 44.10 g/mol0.567 mol C₃H₈
× 3 × 44.01 g/mol74.9 g CO₂
What if only 60.0 g of oxygen is available?

Now oxygen is the limiting reagent, so it caps the yield:

60.0 g ÷ 32.00 g/mol1.875 mol O₂
÷ 5, the smaller ratioO₂ limits
3 × 0.375 × 44.01 g/mol49.5 g CO₂
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What favors SN2 over SN1?

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Why is water's boiling point so high?
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What favors SN2 over SN1?

A strong nucleophile and an unhindered primary substrate

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Weak acid titration pH

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Which compound has the higher lattice energy?

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NaCl

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ChemistryIQ covers all major chemistry topics including equation balancing, stoichiometry, Lewis structures, VSEPR theory, thermodynamics, kinetics, equilibrium, acid-base chemistry, electrochemistry, organic chemistry mechanisms, and more. It's designed for AP Chemistry, General Chemistry, and Organic Chemistry courses.

Simply snap a photo of any chemistry problem - whether it's from your textbook, homework, or practice exam. Our AI instantly identifies the problem type, applies the correct chemistry principles, and provides step-by-step solutions with proper calculations and explanations.

Yes! ChemistryIQ covers all 9 units of AP Chemistry, from atomic structure to applications of thermodynamics. The detailed explanations help you understand both multiple choice and free response question types to prepare for exam day.

Absolutely. Every solution includes detailed step-by-step explanations showing exactly how to arrive at the answer. You'll learn not just the what, but the why behind each calculation, reaction mechanism, or concept.

ChemistryIQ handles virtually any chemistry problem: equation balancing, stoichiometry calculations, limiting reagent problems, pH calculations, equilibrium constants, thermodynamics (Gibbs free energy, enthalpy), electrochemistry, organic reaction mechanisms, and more.

Download ChemistryIQ from the App Store, open the app, and point your camera at any chemistry problem. You'll get instant analysis and step-by-step solutions to help you understand the material.

Yes! ChemistryIQ excels at organic chemistry, covering functional groups, nomenclature, reaction mechanisms (SN1, SN2, E1, E2), stereochemistry, synthesis strategies, and spectroscopy interpretation. It helps you understand why reactions happen, not just memorize them.

Yes, ChemistryIQ includes a scan history feature that saves all your solved problems. This is perfect for reviewing before exams or building a personal study library of chemistry examples.

ChemistryIQ is excellent for MCAT chemistry review. It covers general chemistry, organic chemistry, and biochemistry concepts tested on the Chemical and Physical Foundations section. Use it to reinforce your understanding of challenging topics.

Yes! ChemistryIQ can balance any chemical equation, including complex redox reactions. It shows you the systematic approach to balancing, explains why coefficients are needed, and verifies the answer by counting atoms on both sides.