Limits are often calculated as weight per weight. The Limit of sulfate impurity in a drug substance (weight per weight) is given as 0.5 µg of sulfate per gram of drug substance. Convert 0.5 µg of sulfate per gram of drug substance into% (wt/ wt)?

What is the percent by weight (w/w%) of sugar in soda? Assume the average mass of sugar in soda is 22.0 g and the total mass is 370.0 g.

A local water retention pond was found to have elevated levels of mercury concentrated as 14 ng per liter. You would like to collect some mercury for your homemade perpetuum mobile machine. How many moles of mercury can you get you collect and process the entire volume of 1250 m3 of the water in the pond? 1.8 x 10-5 moles 4.4 x 10:5 moles 1.8 x 10-2 moles 8.7 x 108 moles 7.6 x 10-5 moles O 4.4 x 108 moles 8.7 x 105 moles

How many moles of NaOC1 would be present in 1 gallon of commercial bleach (density = 1.05 g/ml), which is 6.25% mass percent active ingredient. (1 L = 1.057 qt.)