CH. 3 Stoichiometry Pt.1 PDF

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SI Leader: Linda Bui Chapter 3: Stoichiometry Pt.1 Name and define the three types of chemical Reactions 1. Combination: 2. Decomposition: 3. Combustion: Mole / Avogadro’s Number = 6.022 x 1023 1. How many moles are in 15 grams of chlorine?

2. How many atoms are in the sample of chlorine?

Molar Mass 1. A sample of Calcium Carbonate is 486g, how many moles are in this sample?

2. How many grams of just the Carbonate ions (from the previous problem) are in the sample?

SI Leader: Linda Bui 3. Acetone (C3H6O) is most commonly used to remove nail polish. 2.00 x 10-4 grams of acetone is placed on a cotton ball. How many molecules can be found in that sample?

Balancing Chemical Equations * All combustion reactions produce what 2 molecules? 1. 2.

*Be sure to indicate the physical state of each compound 1. Ammonia Gas, (NH3) reacts with oxygen to form gaseous nitrogen monoxide and water vapor. Write the balanced chemical equation for this reaction.

2. Jimmy is having a barbecue. He is using a propane grill (C3H8). He accidently lights the whole tank on fire. Write the chemical equation for this combustion reaction.

3. Solid nitrogen triiodide is very explosive and will corrode with contact. It will decompose to iodine vapor and nitrogen gas. Write the chemical equation for this decomposition reaction.

SI Leader: Linda Bui 4.

Liquid cyclopentadiene (C5H6) undergoes combustion in an atmosphere of oxygen. Write the balanced chemical equation.

Empirical Formula vs. Molecular Formula 1. An unknown hydrocarbon arrives at the lab. An analysis reveals that the unknown contains 92.26% C and 7.74% H. a) Write the empirical formula for the unknown hydrocarbon

b) If the molar mass of the unknown hydrocarbon is 78.11 g/mol, write its molecular formula

2. Caffeine contains 49.48% C, 5.15% H, 28.87% N, and 16.49% O and has a molar mass of 194.2 g/mol. What is its molecular formula?

SI Leader: Linda Bui 3. The most common form of nylon is called nylon-6. It Is composed of 63.68% carbon, 12.38% nitrogen, 9.80% hydrogen, and 14.14 % oxygen by mass. What is the empirical formula for nylon-6?...