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Posted by on Monday, July 6, 2009 at 4:58pm.

What volume of benzene (C6H6, d= 0.88 g/mL, molar mass = 78.11 g/mol) is required to produce 1.5 x 103 kJ of heat according to the following reaction?

2C6H6(l)+15O2(g)-->12CO2(G)+6H2O(g) :delta:Hrxn=-6278kj

  • Chemistry - , Monday, July 6, 2009 at 5:06pm

    The reaction you show is for two moles benzene. Since the molar mass is 78.11 g/mole, then 2 moles is 2 x 79.11 = 156.22 grams. Thus 156.22 g benzene will produce 6278 kJ of heat. You want to produce 1500 kJ. Use proportions to determine the mass of benzene needed, then use density = mass x volume to convert to volume. Post your work if you get stuck.

  • Chemistry - , Monday, July 6, 2009 at 6:33pm

    THank you problem solved

  • Chemistry - , Tuesday, December 11, 2012 at 10:35pm

    actually density=mass divided by volume

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