3 years ago

Which of the following is NOT a characteristic of most ionic compounds?

Chemistry

1 answer:

Goryan [66]3 years ago

4 0

What are the options?

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6.45 g of C6H12O6 is burned in a bomb calorimeter containing 950. g of water and the temperature goes from 35.0∘C to 42.3∘C. If

emmasim [6.3K]

Answer:

$q_{rxn}=-488.86\frac{kJ}{mol}$

Explanation:

Hello!

In this case, since this calorimetry problems can by analyzed by figuring out that the heat lost due to the combustion of C6H12O6 is gained by the water and the calorimeter which undergo the mentioned temperature rise, we can write:

$Q_{rxn}=-(m_wC_w+C_c)(T_2-T_1)$

Thus, by plugging in the given data, we obtain:

$Q_{rxn}=-(950.0g*4.184\frac{J}{g\°C} +933\frac{J}{\°C})(42.3\°C-35.0\°C)\\\\Q_{rxn}=-17.5kJ$

Next, we compute the moles of C6H12O6 by using its molar mass (180.18 g/mol) as shown below:

$n=6.45g*\frac{1mol}{180.18g} =0.0358mol$

Thus, the value for q of the reaction turns out:

$q_{rxn}=\frac{Q_{rxn}}{n} \\\\q_{rxn}=\frac{17.5kJ}{0.0358mol} \\\\q_{rxn}=-488.86\frac{kJ}{mol}$

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