1. Calculate the amount of heat (q) produced by the combustion of 4.05 g CH4 (Hc

Question

1. Calculate the amount of heat (q) produced by the combustion of 4.05 g CH4 (Hcomb = -890.4 kJ/mol).

2. Construct a table listing all the data and values you will need to record or find to calculate the specific heat of a single Vienna sausage. Be sure to indicate whether you will need to measure these values or find them from another source. Also make sure you leave enough space for recording these values (with units!) (HINT: Remember q = mcT...what do each of these variables stand for? How do you find T?)

3. Recall the 4.05 g methane combusted in Question 1. Assuming all of the heat from this combustion is absorbed by 1.0 kg of 20. ºC water (ignore the pot holding the water, and use 4.18 J g-1 ºC-1 for the specific heat of the water). What would be the final temperature of the water? This question can be answered in a few steps.

     a.) First, rearrange equation 3 to solve for T. Show your rearrangement of equation 3 below.

     b.) Now, plug into your equation the values for q, m, and c to find T (be mindful of your kJ and J units).

     c.) Finally, knowing T and the initial temperature, TI, find the final temperature, TF, of the water.

Explanation / Answer

Ans 1 :

Molar mass of CH4 is 16.04 g/mol

4.05 g CH4 = 4.05 / 16.04 = 0.25 moles

Enthalpy of combustion for CH4 is -890.4 KJ/mol

So the enthalpy of combustion for 4.05 g CH4 will be :

=0.25 x -890.4

= -222.6 KJ

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