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

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.

може ли да зареждате повече информация, моля