Homework 4 Recall the stoichiometric coefficients (the numbers before the indivi

Question

Homework 4 Recall the stoichiometric coefficients (the numbers before the individual species) in a balanced chemical reaction refer to the number of moles of that species involved in the chemical reaction. A balanced chemical equation shows the molar relationship between all of the reactants and products. Now, given the following chemical equation: (5 points) 1. 3cu + 8 HNO, 3Cu(NO), + 2 NO + 4 H2O a. Is this equation balanced? (Yes/No) b. How many moles of HNO, are required to react with 6 moles of Cu? c. How many moles of Cu(NO,), are produced when 3 moles of Cu react? d. How many moles of Cu must react to produce 4 moles of NO? e. If 4 moles of NO are produced, how many moles of H,O are also produced? paper work problems 2-5. You must show your work for the problems. (5 points each) The overall equation for the metabolism of sucrose, C12H220,,, is C12H22O" + 120, 12 co, + 11 HO a. How many moles of CO2 are produced when 1 g of sucrose is metabolized? b. How many grams of CO2 are produced when 1 g of sucrose is metabolized? Lithium hydroxide is used in the space program to remove carbon dioxide (from respiration in spacecraft. Specifically, lithium hydroxide, LiOH, reacts with carbon dioxide, CO2, to form lithium carbonate, Li,CO, and water. 2 LiOH + CO2 Li2CO3 + H2O What mass of CO2 can be absorbed by 15 of LiOH? Urea, (NH2),CO, can be prepared by reacting ammonia, NH3, with carbon dioxide. 2 NH, + CO2 (NH2)2CO + H2O If 12.24 g NH, are treated with 22.4 g of CO2 a. b. Identify the limiting reactant. What mass of urea can be produced?

Explanation / Answer

1) a) yes

b) 16 moles,the balanced equation gives 3 mole of Cu took 8 moles of HNO3. Hence if moles of Cu is doubled the moles of  HNO3 will also be doubled.

c) 3 moles, from equation its clearly visible 3 moles of Cu produces 3 moles of Cu(NO3)2

d) 6 moles, the balanced equation gives 3 mole of Cu took 2 moles of NO2. Hence if moles of Cu is doubled the moles of NO2 will also be doubled.

e) 8 moles,  the balanced equation gives 2 mole of NO and 4 moles of H2O. Hence if moles of NO is doubled the moles of H2Owill also be doubled.

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