5. Lead is a poisonous metal that especially affects children because they retain a larger fraction of lead than adults do. Lead levels of 0.250ppm in a child cause delayed cognitive development. How many moles of lead present in 1.00g of child's blood would 0.250ppm represent. 6. Acetone, CaHe, is the main ingredient of nail polish remover. A solution is made up by adding 35.0mL of acetone (d=0.790g/mL) to 50.0mL of ethyl alcohol, CHO (d=0.789g/mL). Assuming volumes are additive, calculate (a) the mass percent of acetone in the solution. (b) the volume percent of ethyl alcohol in the solution. (c) the mole fraction of acetone in the solution.

can someone show how to obtain   opeerating line from component balance and boil up ratio

Problem2 An industrial 1000kg water-oil mixture that is 20 wt% oil, is treated in a two-stage process to separate the oil from water. The first stage consisting of decantation results in a 100kg mixture that is 75 wt% oil. The remaining part is treated through a separator, but for technical restrictions had to be further diluted by adding 100kg of water before feeding it into the separator. The output streams from the separator consist of an oil-dilute (5 wt%) and an oil-concentrated (90 wt% ) solution. Determine: (a) the oil mass concentration in the feed entering the separator, (b) the masses of oil in the two output streams.

(optional) Design a solar collector: Following the steps to decide the size of a solar collector. Step1: the customer wants to heat 500 liters of water from 15 to 80 C. How much heat is required? Step2: the local daily solar insolation rate is 1.13*107 J/m2. How much heat the solar can provide per m2? Step3: if 33% of solar energy can be used to heat water (q) with a solar collector, how much heat can be used to warm up cold water? Step4: what collector surface area is A (m2) required?