How much heat is gained in joules by the water where a chemical reaction takes place in 100 mL aqueous solution and has a temperature increase of 12 C

To calculate the heat gained by the water, we need to use the formula:

Q = mcΔT

Where:
Q is the heat gained or lost (in joules)
m is the mass of the water (in grams)
c is the specific heat capacity of water (4.18 J/g°C)
ΔT is the change in temperature (in °C)

First, let's find the mass of the water in the solution. We know that the solution has a volume of 100 mL. Since the density of water is approximately 1 g/mL, the mass can be calculated as follows:

mass = volume × density
mass = 100 mL × 1 g/mL
mass = 100 g

Now, we can substitute the values into the formula:

Q = (100 g) × (4.18 J/g°C) × (12 °C)
Q = 5016 J

Therefore, the water gains approximately 5016 joules of heat during the chemical reaction.

12