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~

Excuse ! extra points plus ! super desperate ! the position of an object does not move relative to a reference point. relative to the reference point the object _. a.) is not moving. b.) is moving.

Next a skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 15 with the horizontal. the rope moves parallel to the slope with a constant speed of 0.69 m/s. the force of the rope does 800 3 of work on the skier as the skier moves a distance of 8.4 m up the incline. (a) if the rope moved with a constant speed of 2.2 m/s how much work would the force of the rope do on the skier as the skler moved a distance of 8.4 m up the incline? at what rate is the force of the rope doing work on the skier when the rope moves with a speed of (b) 0.69 m/s and (c) 2.2 m/s?

(**i would really appreciate if this was answered soon** ) which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?