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Stoichiometry

Stoichiometry review questions

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A substance with the formula AB has the composition by mass of 30% A and 70% B. What is the composition by mass of the compound A2B? 70% A, 30% B 50% A, 50% B 46% A, 54% B 60% A, 40% B 65% A, 35% B A mass of 21.5 grams of calcium hydroxide reacts with an excess of phosphoric acid. What mass of calcium phosphate could be recovered from solution? 31.6 grams 94.7 grams 326 grams 284 grams 186 grams Given the equation 3A + 4B ? 2C + 3D, you react 5 moles of A with 7 moles of B. Which of the following statements is true? B has a greater molar mass than A A is the limiting reactant A has a greater molar mass than B

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Chemistry Final Review Guide 2012 The 1st Section on the final will be metric conversions, significant figures, and scientific notation. The 2nd Section on the final will be multiple choice questions. There will be 40 of them and they will cover vocabulary and basic chemistry questions. The BEST way to study for this section would be to gather all old chemistry tests and review all of the multiple choice questions The 3rd Section will be calculations split into 3 parts. Part A will focus on writing chemical equations from word equations, balancing them, and then stating what type of reaction it is. For example: 1. Solid aluminum reacts with oxygen gas to produce aluminum oxide.

Chemical Equilibria checklist

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Chemical Equilibria

South Pasadena ( AP Chemistry [Keep for Reference] 16 ( Chemical Equilibria BLUFFER?S GUIDE ? 1. aA +bB + . . . rR +sS + . . . Kc = and for gases: Kp = 2. K > 1 products favored K < 1 reactants favored 3. Excluded: solids; pure liquids; water (in aqueous solutions) because their [ ]?s do not change. 4. Convert from Kc to Kp Kp = Kc(RT)(n where (n = moles of gaseous product ? moles of gaseous reactant. 5. Typical question: Given Kc and the starting concentrations of reactants, find concentrations of products at equilibrium. Example: Kc for acetic acid = 1.8 x 10-5. What is the equilibrium concentration of [H+] in a 0.100 M solution of the acid? 6. Equilibrium constant for a reverse reaction = the value of the forward reaction.

Stoichiometry

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Stoichiometry

Chemistry 1210: General Chemistry Dr. Gina M. Florio 13 September 2012 Jespersen, Brady, Hyslop, Chapter 4 The Mole and Stoichiometry CHE 1210 Lecture Slides G.M. Florio 1 Conversion Factors Conversion Factor ? relates one quantity to another ? used to convert between two units in chemistry What is my height in centimeters (cm) if I am 5 feet 4 inches tall? 1. How many inches are in a foot? 2. How many inches are in a centimeter? 12 inches = 1 foot 1 inch = 2.54 cm Factor Label Method The factor-label method, or dimensional analysis lets us treat a numerical problem as one involving a conversion from one kind of units to another using conversion factors.

Stoichiometry Notes

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Stoichiometry mass and amount relationships between reactants and products in a chemical reaction Rules for Solving Stoichiometry Problems A balanced, properly written equation is essential because the coefficients tell you the mole to mole ratio. Converting to moles is essential! Example: When CaC2 reacts with water, acetylene gas (C2H2) and calcium hydroxide are produced. How many grams of water are required to produce 1.55 moles of C2H2? Step 1: Write a balanced equation. CaC2 + 2H2O ? C2H2 + Ca(OH)2 Step 2: Determine what info you have and what you are trying to determine. You know you need to produce 1.55 moles of C2H2, and you need to determine how many grams of water are required to do this.

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