g A solution containing 3.6 mol of benzene ( C6H6 , b. p. 80°C) and 5.4 mol of toluene (C6H5CH3 , b. p 110°C) is placed in a closed container at 35°C. Some evaporation takes place. What is the mole fraction of toluene in the vapor phase when equilibrium is reached? At 35°C, vapor pressures are: benzene 160. torr, toluene 50.0 torr. HINT: Use Raoult’s Law to find the total vapor pressure, then calculate the fraction of the pressure that is due to toluene vapor. A) 0.52 B) 0.67 C) 0.33 D) 0.14 E) 0.60

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.