# Is there a formula/relationship between $q$, $m$, $c$, $\Delta T$ and $t$ (time)?

I am currently doing an experiment where I am burning methanol to test for the heat of combustion. To test this, I am heating 100g of water and raising it by 20 degrees Celsius before extinguishing the flame.

Using $q=m c \Delta T$, I have calculated that I need 8.4 kJ of energy to heat 100g of water by 20 degrees Celsius. The initial amount of methanol was 3.96g, and the remaining after combustion was 3.59g. This means that 0.37g of methanol was used in the process. The heat of combustion was -726 kJ/mol.

I have forgotten to time my experiment to see how long it took for this to occur. I was wondering if there is a formula or relationship that I can use to calculate this so that I don't have to do the experiment all over again.

• The time taken to heat the water by 20 degrees, will depend on the method used, e.g. temperature of bunsen burner. Jul 31, 2015 at 12:02
• This kind of test is normally done with precision equipment and a calorimeter. If you do this experiment in an open environment, a LOT of heat will dissipate into the environment, and your calculated answer will be WAY LOW. In addition, the data you are looking for is no doubt already published. Jul 31, 2015 at 18:00