Chem_181_Mod5_Assign5 2018

CHEM 181: Chemistry 1. Module 5, assignment 5 CHEM 181: Chemistry I Assignment 5: Quantitative Relationships in Chemical Changes 1. For the unbalanced reaction shown below, calculate how many moles of iron are formed when 4.28 moles of solid zinc completely react. Zn (s) + Fe(NO 3 ) 3 (aq)  Zn(NO 3 ) 2 (aq) + Fe (s) 2. How many liters of oxygen are required to completely combust 12.56 mols of butane? The unbalanced reaction for the combustion of butane: C 4 H 10 (g) + O 2 (g)  CO 2 (g) + H 2 O (g) 3. A technology involves the use of ethanol-blended gasoline as an energy source. Ethanol in this fuel is combusted according to the unbalanced equation below. If 12.6 moles of ethanol reacts, what mass of carbon dioxide is produced? C 2 H 5 OH (l) + O 2 (g)  CO 2 (g) + H 2 O (g)

CHEM 181: Chemistry 1. Module 5, assignment 5 4. For the unbalanced formation reaction shown below, if 24.0 g of each reactant is available, which reactant (Al or O 2 ) will be the limiting reactant ? What mass of aluminium oxide will theoretically be produced? Al (s) + O 2 (g)  Al 2 O 3 (s) 5. Consider the reaction below. A chemist allows 5.55kg of SO 3 to react with an excess of H 2 O. When the reaction is finished, the chemist collects 5.28kg of H 2 SO 4 . Determine: a. Theoretical yield b. Percent yield SO 3 (g) + H 2 O (l)  H 2 SO 4 (aq)