Computing the mass of propylene glycol
Calculate the mass of propylene glycol ({rm{C}}_3 {rm{H}}_8 {rm{O}}_2 ) that must be added to 0.340 kg of water to reduce the vapor pressure by 2.86 torr at 40 ^circ ,{rm C} (P_{{rm H}_2{rm O}} at 40 ^circ,{rm C} = 55.3;{rm torr}).
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The atomic weight of a newly discovered el- ement is 98.225 amu. It has two naturally occuring isotopes. One isotope has a mass of 96.780 amu. The second isotope has a per- cent abundance of 41.7%. What is the mass of the second isotope?
The light right-angle boom which supports the 400-kg cylinder is supported by three cables and a ball-and-socket joint O attached to the vertical x-y surface. Determine the reactions at O and the cable tensions.
A control system is needed to control a small shopping center parking lot lighting system and the exterior lighting for the building. The design specifications require that the parking lot lighting and the exterior lighting turn on at dusk aut
Determine the molar ratio of sodium borohydride to 9-fluorenone that you used in the experiment. Why is it necessary to use a greater molar ratio than theoretical?
A gaseous mixture of O2 and Kr has a density of 1.184 g/L at 385 torr and 300. K. What is the mole percent O2 in the mixture?
An air-standard dual cycle has a compression ratio of 18 and a cutoff ratio of 1.1. The pressure ratio during constant-volume heat addition process is 1.1
In the other determination, the sample height is 4-5 mm and themelting range is found to 141-145C. Explain the broader meltingpoint range observed for the second sample. The reported melting point for the compound is 143C.
Consider the dissolution of MnS in water (Ksp = 3.0 × 10-14). How is the solubility of manganese(II) sulfide affected by the addition of aqueous potassium hydroxide to the system?
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In three sentences summarize the paragraph to answer the question What Role Do Children Play in Their Own Development?
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