You have a 12 oz. can (355 ml) of beer. you test the temperature and see that it reads 0◦c. now this isn’t just any beer; this is guinness and you’ve heard that guinness is best at room temperature (20◦c). if the specific heat 3 of guinness is 4.186 j/g· ◦c, how much heat should you add in order to raise the temperature? the density of guinness is 1.2 g/ml.

3.5 × 10³ J

Explanation:

The heat required to raise the temperature of the beer can be calculated using the following expression.

Q = c × m × ΔT

where,

Q: heat

c: specific heat capacity

m: mass

ΔT: change in the temperature

The volume of the beer is 35 mL and its density 1.2 g/mL. The mass of the beer is:

mass = volume × density

35 mL × (1.2 g/mL) = 42 g

Q = c × m × ΔT

Q = (4.186 J/g.°C) × 42 g × (20]°C - 0°C) = 3.5 × 10³ J

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