Question 1

Calculate the mass in grams of water that can be manufactured when 105.993 g of methane combust completely in excess oxygen gas. Provide your answer to two decimal places and without units. [ Molar Mass of Methane= 16.042]

Question 2

A working standard 1 was prepared by taking 41.09 mL of a 500.0 ppm stock solution and diluting it to a final volume of 415.3 mL. Working standard 2 was prepared by taking 8.59 mL of working standard 1 and diluting it to a final volume of 250.0 mL. Calculate the ppm concentration of the working standard 2. Provide your answer to three places after the decimal and without units.

Hint: this is a sequential serial dilution calculation. Draw diagrams to visualize the process before applying the Dilution Law.