Calculate the number of grams in one mole of ZnC12.6H20 (calculate molecular weight)? O=16.00 H=1.01 Zn=65.39 Cl=35.45

Calculate the mass of each product formed when 43.82 g of diborane (B₂H₆) reacts with excess water:B₂H₆(g)+ H₂O(l)→H₃BO₃(s)+ H₂(g) [unbalanced]

2. Suppose a new fuel cell is proposed, working on the gas-phase reaction 1 → - CO₂ (such devices already exist in the solid state this question will assume just gas phase reactions etc). If the device is to operate at a temperature of 400K and initially at a pressure of 1 bar: (a) Calculate the open circuit voltage produced by the fuel cell [4 marks] (b) Calculate the mass flow rate (in kg/hr) of CO required to produce a power output 1kW [1 mark] (c) Calculate the entropy change of the system during the reaction (d) Calculate the heat rejected to maintain isothermal conditions (e) Calculate the irreversibility arising as a result of the fuel cell's operation. [2 marks] [3 marks] [5 marks] (f) As part of the design revision, the operating pressure is raised to 35bar, with the temperature maintained constant. Repeat steps 1-5; what observations do you make? [10 marks]

Q1.  Imagine you are working for an automotive manufacturer and are selecting plastic materials for various components. Draw the structure of a material you might use for a soft touch plastic. Now draw the structure of a material you might use in the drive train (i.e., an engineering plastic). What characteristics are you engineering into the material?   Q2. Based on what you know about the calorimetry of melting and crystallization, do you expect melting to be endothermic or exothermic? What about condensation? Can we say anything general about heat flow in the process of forming bonds, covalent or van der Waals?

We are given a sample of polypropylene with the following composition. What is the number average molecular weight? mol% of chains MW (g/mol) 35 50000 20 100000 40 500000

a) The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount of heat transfer is measured. How many kilocalories per gram are there in a 5.00-g peanut if the energy from burning it is transferred to 0.500 kg of water held in a 0.100-kg aluminum cup, causing a 54.9C temperature increase? (b) Compare your answer to labeling information found on a package of peanuts and comment on whether the values are consistent.

An unknown polymer sample was found to have the following molecular weight distribution: Molecular weight range xi 8,000 -20,000 0.05 20,000 - 32,000 0.15 32,000 44,000 0.21 44,000 56,000 0.28 56,000 -68,000 0.18 68,000 - 80,000 0.10 80,000 - 92,000 0.03 Having a DP=763, which of the following common polymers is this sample? Select one: wi 0.02 0.08 0.17 0.29 0.23 0.16 0.05 a. Polymethylmethacrylate with a monomer molecular weight of 100.121 g/mol b. Polyvinyl chloride with a monomer molecular weight of 62.498 g/mol c. Polycarbonate with a monomer molecular weight of 61.0168 g/mol d. Polypropylene with a monomer molecular weight of 42.08 g/mol e. Polystyrene with a monomer molecular weight of 104.15 g/mol

What is the solubility of naphthalene at 50 C in an ideal solution? The melting point of naphthalene is 90 C and the molar heat of fusion is 3500 cal/mole. the gas constant = 1.987 cal mol'degree %3D Select one: O a. 0.55 Ob.93.3 Oc.0.27 Od.6.7

Consider de-oxidation by the addition of ferromanganese (60 percent Mn) to molten steel at 1600°C.The initial oxygen content is 0.04 wt%. It has to be brought down to 0.02 wt%. Calculate the quantity of ferromanganese required per tonne of steel. The manganese content of steel before de- oxidation is 0.1 wt%. (MnO) + [Fe] = [Mn] + (FeO) Given: K Mn at 1873 K = 0.4 K Fe-Mn at 1873 K = 0.156 Assumptions: Fe and Mn form ideal solutions