Physics, 18.12.2019 06:31, avagymnast421

In an experiment to determine δh for the reaction between hbr and naoh , 43.6 ml of 1.08 m hbr at 19.95 °c is placed in a coffee cup calorimeter which has a heat capacity of 7.99 j/°c. 43.6 ml of 1.08 m naoh at 19.95 °c is added to the acid solution in the calorimeter and quickly mixed. a final temperature of 26.88 °c was recorded. what is δh for this reaction, in kj? assume that the specific heats of all solutions are the same as for pure water (4.18 j g-1 °c-1), and that all solution densities are 1.00 g/ml. don't forget to put the proper sign on your δh value.

Answers: 3

Show answers

Other questions on the subject: Physics

Physics, 21.06.2019 23:30, asco0317p34v1s

Classify the following soils according to the uscs classification system. provide appropriate uscs designations. a) this sample of well-graded gravel with sand was obtained from a large earthen dam in vancouver, canada. the sample has 73% fine to coarse sub-angular gravel, 25% fine to coarse sub-angular sand and 2% fines. the maximum size of the particles is 75 mm. the coefficient of curvature is 2.7, while the uniformity coefficient is 12.4. b) this dark brown and wet soil with a â€śstrong organic odorâ€ť has 100% passing the no. 200 sieve. the liquid limit of the material is 32% when not dried and is 21% when oven-dried. the plastic index is 21% when not dried. c) this sand has 61% predominantly fine sand, 23% silty fines, and 16% fine sub-rounded gravel size. the maximum size is 20 mm. the liquid limit is 33% and the plastic limit is 27%. d) this soil has 74% fine to coarse sub-angular reddish sand and 26% organic and silty dark brown fines. the liquid limit is 37% when not dried and is 26% when oven dried. the plastic index is 6% when not dried.

Answers: 1

continue

Physics, 22.06.2019 05:20, cwsmith8026

Very large accelerations can injure the body, especially if they last for a considerable length of time. one model used to gauge the likelihood of injury is the severity index ( ), defined as =/ . in the expression, is the duration of the accleration, but is not equal to the acceleration. rather, is a dimensionless constant that = the number of multiples of that the acceleration is equal to. in one set of studies of rear-end collisions, a person's velocity increases by 13.7 km/h with an acceleration of 36.0 m/s2 . let the + direction point in the direction the car is traveling. what is the severity index for the collision?

Answers: 1

continue

Physics, 22.06.2019 06:00, nelsy7610

Suppose water is leaking from a tank through a circular hole of area ah at its bottom. when water leaks through a hole, friction and contraction of the stream near the hole reduce the volume of water leaving the tank per second to cah 2gh , where c (0 < c < 1) is an empirical constant. a tank in the form of a right-circular cone standing on end, vertex down, is leaking water through a circular hole in its bottom. (assume the removed apex of the cone is of negligible height and volume.) (a) suppose the tank is 20 feet high and has radius 8 feet and the circular hole has radius 2 inches. the differential equation governing the height h in feet of water leaking from a tank after t seconds is dh dt = − 5 6h3/2 . if the height of the water is initially 8 feet, how long will it take the tank to empty? (round your answer to two decimal places.)

Answers: 2

continue

Physics, 22.06.2019 18:00, Yungnaudie

Astudent weighing 700 n climbs at constant speed to the top of an 8 m vertical rope in 10 s. the average power expended by the student to overcome gravity is most nearly

Answers: 2

continue

Do you know the correct answer?

In an experiment to determine δh for the reaction between hbr and naoh , 43.6 ml of 1.08 m hbr at 19...