Hrxn = -m csystem δt

0.7180 ± 0.0002 g of kno3 was added to 100.00 ± 0.02 g of h2o in a solution calorimeter.

csystem = 121.46 ± 1.23 cal/°c and δt = -0.508 ± 0.009 °c.

(a) (1 pt) calculate the molar enthalpy change δh~rxn for the dissolution of kno3 in water.

(b) (2 pts) calculate in the error in δh~

Does anyone know how to solve this problem? i really need . i made an attempt but i just cant get it. a metal rod is 25.000 cm long at 25.0 degrees celsius. when heated to 102.0 degrees celsius, it is 25.054 cm long. what is the coefficient of linear expansion for this metal.

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.

On a geologic map, if the contacts between sedimentary rock units form a bull’s-eye pattern of concentric circles, with the youngest unit in the center, the underlying structure is a(n)