A spirit burner containing ethanol is weighed before and after use. The weight loss was 0.4g. If the burner was being used to heat 75mL of water inside a container, calculate how must the...

  1. A spirit burner containing ethanol is weighed before and after use. The weight loss was 0.4g. If the burner was being used to heat 75mL of water inside a container, calculate how must the temperature of the water in the container increased.

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sciencesolve | Teacher | (Level 3) Educator Emeritus

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You need to determine the final temperature of the 75mL = 75 grams of water heated with ethanol burner.

You may use the basic information that the change in temperature of 200g water and 1.75 g ethanol used is of `Delta T = 55^oC` .

You should come up with the notation x for the change in temperature of 75 g water and 0.4 g ethanol used, such that:

`{(200g->55^oC),(75g->x^oC):} => x = (75*55)/200 => x = 21^oC`

Supposing that the initial temperature was `T_i = 20^oC` you may evaluate the change in temperature, such that:

`Delta T = T_f - T_i => 21^oC = T_f - 20^oC => T_f = 21^oC + 20^oC => T_f = 41^oC`

Hence, evaluating the final temperature of water, under the given conditions, yields `T_f = 41^oC.`

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