Combustion of 7.54 g of liquid benzene (c6h6) causes a temperature rise of 50.3°c in a constant-pressure calorimeter that has a heat capacity of 6.27 kj/°c. what is ∆h for the following reaction? c6h6(l) + o2(g) → 6co2(g) + 3h2o(l)

-3268 kJ/mol

Explanation:

The calorimeter is an equipment used to measure the heat from a combustion reaction. The heat can be calculated by:

Q = C*ΔT

Where Q is the heat, C is the heat capacity of the calorimeter, and ΔT is the variation of the temperature. So:

Q = 6.27 * 50.3

Q = 315.381 kJ

Because the calorimeter is adiabatic, the heat absorbed by it must be equal to the heat released for the reaction, so the heat of the reaction is:

Q = -315.381 kJ

The change in enthalpy (ΔH) is the heat divided by the number of moles of the limiting reactant. The combustion is commonly done with oxygen in excess, so benzene is the limiting reactant. Benze has a molar mass equal to 78.11 g/mol, so the number of moles is:

n = mass/molar mass

n = 7.54/78.11

n = 0.0965 moles

ΔH = Q/n

ΔH = -315.381/0.0965

ΔH = -3268 kJ/mol

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.