The heat capacity of a bomb calorimeter was determined by burning 6.79 g of methane (energy of combustion = -802 kj/mol ch4) in the bomb. the temperature changed by 15.7°c. (a) what is the heat capacity of the bomb?

The answer to your question is: Cp = 7.52 kJ/g°C

Explanation:

Data

Cp = ?

mass = 6.79 g

Energy = -802 kJ/mol   CH₄

ΔT = 15.7°C

Formula

Q = mCpΔT

Solve for Cp

Process

- Convert energy to J

                                     -802kJ/mol = - 802 000 J/mol

- Calculate heat capacity

                                 Cp = 7523 J/ g°C   or

                                 Cp = 7.52 kJ/g°C

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.

d.) circle motion requires a force to give it a centripetal acceleration.