Problem 2 [o 1,021 a steel tube having k = 46 w/m-c has an inside diameter of 3.0 cm and a tube wall thickness of 2 mm. a fluid flows on the inside of the tube producing a convection coefficient of 1500 w/m2-oc on the inside surface, while a second fluid flows across the outside of the tube producing a convection coefficient of 197 w/m2-oc on the outside tube surface. the inside fluid temperature is 223 c while the outside fluid temperature is 57 c. calculate the heat lost by the tube per meter of length.

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.

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year