Let's assume you have infinite amount of dilute aqueous solution of gold that only contains gold at a concentration of 1x10.10weight raction. if you would like to get the gold by evaporating water (say by heating from 25 °c to 100 °c at 1 atm pressure, how much energy you will need to produce 1 gm of gold. for industrial consumption, average cost of electricity is $0.0665 kw h. from steam table you may find that to evaporate water into steam at 100°c and 1 atm pressure, 2675.4 kj of energy needed per kg of water. what would be the cost per gram of gold from your production facility only on the basis of evaporation (cost of electric energy)? how does it compare with the market price? today's price of gold: $39.14/gm.

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.

Water undergoes a large change in density at 0 ∘ c as it freezes to form ice. calculate the percent change in density that occurs when liquid water freezes to ice at 0 ∘ c given that

Ascientist conducted an experiment and discovered that certain plants grow faster when given a particular amount of fertilizer. anouther scientist conducted the same experiment and got similar results. which concept does this best illustrate? a) repetition b) replication c) precision d) validity