What volume is occupied by 35.0 g of C_2H_2 at 471 mm Hg and 21 degree C? (R = 0

Question

What volume is occupied by 35.0 g of C_2H_2 at 471 mm Hg and 21 degree C? (R = 0.08206 L.atm/mol middot K) 0.0689 L 20.1 L 52.3 L 29.0 L 3.74 L Determine the enthalpy change for the oxidation of ethanol to acetic acid. CH_3CH_2OH(l) + O_2(g) rightarrow CH_2COOH(l) + H_2O(l) given the thermochemical equations below 2 CH_3CH_2OH(l) + O_2(g) rightarrow 2 CH_3CHO(l) + 2 H_2O(L) deltaH degree = -400.8 kJ/mol-rxn CH_3CHO(l) + O_2(g) rightarrow CH_3COOH(l) delta H degree = - 584.4 kJ/mol-rxm +183.6 kJ/mol-rxn +492.6 kJ/mol-rxn -492.6 kJ/mol-rxn -183.6 kJ/mol-rxn -985.2 kJ/mol-rxn Which one of the following statements is INCORRECT? Energy is the capacity to do work Energy is neither created nor destroyed m chemical reactions Increasing the thermal energy of a gas increases the motion of its atoms Exothermic processes transfer heat from the system into the surroundings Kinetic energy is the energy that results from an object's position Which of the following statements arc postulates of the kinetic-molecular theory of gases? Gas particles are in constant, random motion. The distance between gas particles is large in comparison to their size. The average kinetic energy of gas particles is proportional to the kelvin temperature I only 2 only 3 only I and 2 1, 2, and 3 If 6.46 L of gaseous ethanol reacts with 16.1 L O_2, what is the maximum volume of gaseous carbon dioxde produced? Assume that the temperature of the reactants and products is 425 degree C and the pressure remains constant at 1.00 atm CH_3CH_2OH(G) + 3 O_2(g) RIGHTARROW 2 CO_2(G) + 3 H_2O(g)10.7 L 12.9 L 22.6 L 16.1 L 6.46 L Specific heat capacity is a the capacity of a substance to gain or lose a 1.00 J of energy m the form of heat b the maximum amount of energy in the form of heat that 1 00 g of a substance may absorb without decomposing c the quantity of heat needed to change the temperature of 1.00 g of a substance by 1 K. d the temperature change undergone when 1.00 g of a substance absorbs 4 184 J c. the quantity of heat needed to change the temperature of 1 00 g of a substance by 4.184 K. Which of the following processes is/are endothermic? the combustion of hydrogen the condensation of water the evaporation of isopropyl alcohol I only b. only 3 only d. 1 and 3 1, 2, and 3

Explanation / Answer

Obtain molar mass of C2H2

26.04 g/mol

Convert T and pressure into K and atm respectively

T = 21+273.15 = 297.15 K

P= 471 / 760 = 0.6197 atm

Calculate mole of C2H2

35.0 g x 1 mol /26.04 g = 1.344 mol C2H2

Calculate volume using pV=nRT

V=nRT/p

1.344 mol x 0.08206 L atm per (K mol) x 297.15 K / 0.6197 atm = 52.3 L

Answer volume occupied is 52.3 L

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