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- A sample of pure sodium has a mass of 17.4 g. Calculate the number of moles in the sample and sodium atoms in the sample. HINT (a) moles in the sample moles (b) sodium atoms in the sample atomsExpanding the gas in a container to five times its volume at a constant temperature results in a final gas pressure that is how many times the original. 0.2 5 0.5 207. The figure shows a 50 kg lead cylindrical piston which floats on 0.68 mol of compressed air at 30°C. How far does the piston move if the temperature is increased to 300°C? 130 cm 250 cm 50 kg 1300 cm 120 cm 30°C 10 cm
- A sample of pure sodium has a mass of 15.7 g. Calculate the number of moles in the sample and sodium atoms in the sample. HINT (a) moles in the sample moles (b) sodium atoms in the sample atomsI need help with both questions pleaseQuestion 14 An ice cube is dropped into a mixed drink containing alcohol and water. The ice cube sinks to the bottom. From this you can conclude,
- If the mole fraction of n-pentane in a liquid mixture is 0.43, and its partial pressure (vapor pressure) above the liquid is 0.24 bars, what is the vapor pressure of pure n-pentane at the same temperature (in bars)? Assume it is an ideal solution. 0.0 0.24 1.79 0.56 0.103 OOOOWhat is the normal boiling point for liquid B? vapor P, atm A. 40 °C B. 110 °C C. 90 °C D. 75 °C 1.5 1.0. 0.5 0 50 °C 100 B 150Given these densities of various substances: Water.. Wood. Ice 1.0 g/mL .0.65 g/mL .0.92 g/mL 13.54 g/mL .21.5 g/mL .0.88 g/mL ensbet snimes Mercury Platinum Benzene Which substance is the most dense? a. b. Which is the least dense? Which substance will have the least mass if 100 mL is measured? C. Which substance(s) will float on water? d. Which substance(s) will sink in water? e. Which substance(s) will sink in mercury? f.