The ingredients contained in grape Kool-Aid can be approximated as: water (H2O, density = 1.000 g/mL), sugar (sucrose, solid at room temperature, C12H22011), citric acid (solid at room temperature, C6H&O7), and grape flavouring (methyl anthranilate, liquid at room temperature, C3H9NO2, density = 1.168 g/mL). (The blue and red dyes used to produce the purple colour are present in such small quantities that they can be ignored.) A sample of grape Kool-aid having a final total volume of 500 mL can be prepared from: 485 mL of water, 32.0 g of sugar, 5.00 g of citric acid, and 3.50 g or grape flavouring. Calculate the molarity and molality of grape flavouring in this mixture (assume that only water is the solvent).

4.  A solution is prepared by taking a clean and dry 50.00 mL volumetric flask.  Some sucrose (Mm 342.2 g/mol) is added to the flask with the following mass measurements recorded: mass of empty volumetric flask:  142.88 g mass of weighing dish + sucrose: 29.83 g mass of weighing dish after adding sucrose to volumetric flask: 24.62 g Some water is added to the flask, the solution stirred until all the sucrose is dissolved.  Then water is added carefully to the mark on the flask.  The filled flask is then weighed again. mass of filled volumetric flask:   187.30 g What is the mole fraction of water?  Answer to 3 decimal places.

The average concentration of dissolved gold in earth's oceans is  5.8 x 10^−9 g/L. of ocean water.How many micrograms of gold are in 1.1x10^3 m^3 of ocean water?    (1 ml = 1 cm3)

You wish to prepare 237 grams of 26.7% (w/w) KI. Assume that the density of water is 1.00 g/mL. You will need grams of potassium iodide and mL of water.

What is the concentration, in units of grams of dye per liter of solution (g/L), of the dilute dye solution that is produced as follows? Transfer 16.51 mL of the stock solution (6.12 g/L) to a 200.0 mL volumetric flask and dilute to the 200.0 mL line with deionized water. Your answer should be reported to the correct number of significant figures.

A chemist prepares a solution of zinc nitrate (Zn(NO3),) by measuring out 5.2 x 10ʻ µmol of zinc nitrate into a 500. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in umol/L of the chemist's zinc nitrate solution. Be sure your answer has the correct number of significant digits. H mol 回 山国

A student prepares aspirin using 3.985 grams of salicylic acid (MW = 138 g/mol) and 5.78 mL of acetic anhydride (MW = 102 g/mol, density = 1.081 g/mL). What is the theoretical yield of aspirin in grams? Give your answer in in decimal format. When entering units, use proper abbreviated units with proper capitalization._____ (answer) _____ (units)

A high-performance heater that burns propane, C3H8(g), is adjusted so that 100.0 g of O2(g) enters the system for every 100.0 g of propane. Calculate the mol ratio of oxygen to propane. Write the answer as a decimal containing number.      O2 : C3H8   Is this mixture rich or lean?

To aid in the prevention of tooth decay, it is recommended that drinking water contain 0.900 ppm fluoride, F−. How many grams of F− must be added to a cylindrical water reservoir having a diameter of 4.12×10^2 m and a depth of 76.72 m?