4. Argon has 3 stable isotopes: 36 Ar, 38 Ar, and 40 Ar with natural abundances of 0.3365%, 0.0632%, and 99.6003% respectively. The atomic weights of these 3 isotopes are 35.9675 amu, 37.9627 amu, and 39.9624 amu respectively. Calculate the average atomic weight of Ar.

Make a single graph showing the variation of partial pressures with aptitude for 02, CO, CO2, considering a temperature of 300k

9. A hypothetical element (Engineerium, En) has 2 stable isotopes: 123 En and 125 En. If the average atomic weight of En is 124.27 amu, what is the isotopic abundance of each of the stable isotopes?

Q3. The following information on the pressure-temperature diagram of nitrogen: P (atm) T(K) 0.123 33.3978 1.0 Triple point Critical point Normal boiling point Density of N₂(s): 1.03g/cm-³ N₂(1): 0.808g/cm-³ 63.15 126.19 77.35 Using this information, sketch a phase-equilibrium diagram of nitrogen and mark each point. Then, describe why the slope of each phase/phase equilibrium is positive or negative.

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Book: Introduction to Chemical engineering Thermodynamics 8th edition, McGraw Hill, 2018

Question : A sample of a compound has a mass of 41.13 g. The sample is found to contain 37.28 g of carbon and 3.85 g of hydrogen. What is the percentage composition of the compound? 90.6% carbon and 9.4% hydrogen O9.4% carbon and 90.6% hydrogen O 13.3% carbon and 10.8% hydrogen 90.6% carbon and 4.7% hydrogen O 3.1% carbon and 3.8% hydrogen Question 4 Which substance contains the greatest amount (in moles)? 8 g of hydrogen, H2 28 g of nitrogen, N2 35 g of chlorine, Cl2 4g of methane, CH4 Question 6 How many grams are there in 0.0042 mol of sodium oxide, Na, 0? 0.26 g 0.16 g O26.1 g 0.0026 g 260 g Show transcribed data

2.560 g of an unknown compound containing C, H, and O is found through combustion analysis to produce 4.924 g CO2 and 1.728 g H2O. What is the empirical formula of the compound? Show all steps. Hint: recall that combustion analysis assumes the mass (and moles) of each element is conserved throughout the reaction. Molar masses: CO2 = 44.01 g/mol; H2O = 18.02 g/mol

Calculate enthalpies 1 through 6.  For calculating enthalpies 1, 3, 5, and 6, use the method of deltaH = VdeltaP. For calculating enthalpies 2 and 4, use the method of phase changes.  Calculate these enthalpies for the solid, liquid, and vapor states of phenol.

Q2. Use the SEMF to obtain an expression for the Z value of the isobar which will have the lowest mass for a given value of A. Hence, determine which nuclide with A = 103 is predicted to be the most stable.