You place 0.9 g of nh4br into 1 liter of pure water into a 5 l container and seal thecontainer. the ammonium ion can deprotonate to form the weak base ammonia according to the reactionnh4 (aq) ành3(aq) h (aq)some of the ammonia partitions into the air in the bottle. the pka of theammonium ion (nh4 ) is 9.23. what is the ph of the solution

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length

Hydraulic fluid with a sg. of 0.78 is flowing through a 1.5 in. i.d. pipe at 58 gal/min. the fluid has an absolute viscosity of 11.8 x 105 lbf-sec/ft2. is the flow laminar, turbulent or within the critical range? give both a numerical reynolds number and a term answer.