Question

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A student in the chemistry lab reacted liquid hexane (C_6H_14) with oxygen of the air to produce carbon dioxide gas and liquid water. Write a balanced chemical equation for the reaction How many O_2 molecules are required to react completely with 48.8 g of C_6H_14? How many grams of carbon dioxide are produced from 48.8 g of C_6H_14? Determine the amount of Cu_3P formed if 175 grams of copper is reacted with 35.0 grams of P4. What is the limiting reactant? ___ Cu + ___ P_4 rightarrow Cu_3P Aspirin can be synthesized as shown below. For the reaction, 12.4 grams of C_4H_6O_3 is reacted with an excess of C_7H_6O_3. The amount of aspirin, C_9H_8O_4, acquired from the reaction is 26.28 grams. What is the percent yield? 2C_7H_6O_3(s) + C_4H_6O_3(l) rightarrow 2C_9H_8O_4(s) + H_2O(l) The density of a concentrated HCl solution is 1.185 g/mL and it is 36.31% by mass. What is the molarity? What volume of 0.558M HNO_3 solution is required to react completely with 45.55 mL 0.0515MBa(OH)_2? 2HNO_3 + Ba(OH)_2 rightarrow Ba(NO_3)_2 + 2H_2O

Answer 1

(a) 2 C_6 H_14 (l) + 19 O_2 (g) rightarrow 12 CO_2 (g) + 14 H_2 O (g) (b) mass of C_6 H_14 = 48.8 g molar mass of C_6 H_14 = 86 g/mol No. of moles of C_6 H_14 = 48.8/86 = 0.567 mol From balanced equation, 2 mol C_6 H_14 = 19 mol O_2 Then, 0.567 mol C_6 H_14 = 0.567 times 19/2 = 5.39 mol O_2 Therefore No. of molecules of O_2 = 5.39 times 6.022 times 10^23 = 3.24 times 10^24 O_2 molecules (c) From the balanced equation, 2 mol C_6 H_14 = 12 mol CO_2 Then, 0.567 mol C_6 H_14 = 0.567 times 112/2 = 3.40 mol of CO_2 Therefore mass of CO_2 Produced = 3.40 times 44 g = 1.50 times 10^2 g.