Which of the above pictures best represents a solid ionic compound? A) picture (

Question

Which of the above pictures best represents a solid ionic compound? A) picture (a) B) picture (b) C) picture (c) D) picture (d) Calculate the amount of heat (in kJ) required to raise the temperature of a 79.0 g sample of ethanol from 298.0 K to 385.0 K. The specific heat capacity of ethanol is 2.42 J/g degree C. A) 73.6 kJ B) 57.0 kJ C) 28.4 kJ D) 16.6 kJ E) 12.9 kJ Using the following equation for the combustion of octane, calculate the heat associated with the combustion of excess octane with 100.0 g of oxygen assuming complete combustion. The molar mass of octane is 114.33 g/mole. The molar mass of oxygen is 31.9988 g/mole. 2C_8H_18 + 25 O_2 rightarrow 16CO_2 + 18H_2O Delta H degree_rxn = -11018 kJ

Explanation / Answer

25 .

(c) Because ionic solids have highly ordered and closely arrangement of its constituents.

(26.)

Heat required = mass * specific heat * cahnge in temperature

q = 79.0 * 2.42 * (385.0 - 298.0)

q = 16633 J

q = 1.66 kJ

(D)

(27)

Moles of oxygen = 100.0 / 32.9988 = 3.030 mol

According to balaced eqution,

25 mol of oxygen is reponsible for the heat of 11018 kJ

then, for 3.030 mol of oxygen 11018 * 3.030 / 25 = 1335.4 kJ

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