1) Define a Compound 2) Calculate the percentage of chromium in K, Cro- An inorganic substance was analysed and found to be containing 65,31% Of oxygen 32,65% Of Sulphur and X amount of hydrogen 3. 1. Define empirical formula 3.2.) Calculate the percentage of hydrogen element in the substance. 3.3) Determine the empirical formula for the compound. 6,2579, of hydrated copper sulphate was heated, and during heating the moss quas recorded. The mass a the content was decreasing and apter a while the mass remained unchanged at 4g. 4.4) Give a reason why mass decreased 4.2) Calculate the number of motes a water in the original hydrated salt​

As part of an industrial process, air as an ideal gas at 10 bar, 400k expands at steady state through a valve to a pressure of 4 bar. the mass flow rate of air is 0.5 kg/s. the air then passes through a heat exchanger where it is cooled to a temperature of 295k with negligible change in pressure. the valve can be modeled as a throttling process, and kinetic and potential energy effects can be neglected. (a) for a control volume enclosing the valve and heat exchanger and enough of the local surroundings that the heat transfer occurs at the ambient temperature of 295 k, determine the rate of entropy production, in kw/k. (b) if the expansion valve were replaced by an adiabatic turbine operating isentropically, what would be the entropy production? compare the results of parts (a) and (b) and discuss.

Examine the equation. 23490th→23088ra+42he what kind of barrier would you need to block the radioactive particles from this reaction? a. a piece of paper b. a sheet of aluminum foil c. a two-inch block of lead d. a solid concrete block

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.