When 1224 j of heat energy is added to 39.6 g of ethanol, c 2 h 6 o , the temperature increases by 12.6 ∘ c. calculate the molar heat capacity of c 2 h 6 o .

The molar heat capacity is 112.96 J/mol°C

Explanation:

Step 1: Data given

Amount of energy = 1224 J

Mass of ethanol = 39.6 grams

Temperature increases by 12.6 °C

Step 2:

Molar heat capacity is a measure of the amount of heat necessary to raise the temperature of one mole of a pure substance by one degree K.

Specific heat capacity is a measure of the amount of heat necessary to raise the temperature of one gram of a pure substance by one degree K.

Step 3: Calculate moles of ethanol

Moles ethanol = mass of ethanol / molar mass ethanol

Moles ethanol = 39.6g / 46.07 g/mol

Moles ethanol = 0.860 moles

Step 4: Calculate the specific heat capacity

q = m*c*ΔT

1224 = 39.6 * c * 12.6

the specific heat capacity of ethanol = 2.45 J/g°C

Step 5: Calculate the molar heat capacity

q = n * c *ΔT

1224 J = 0.860 moles * c * 12.6 °C

c = 112.96 J/mol°C

This can be controlled by: specific heat capacity * molar mass

2.45 J/ g°C * 46.07 g/mol = 112.9 J/ mol °C

The molar heat capacity is 112.96 J/mol°C

i'm assuming that the correct answer is indeed the first one/ "a"..

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .