How many grams of petrolatum should be added to 100 grams of a15% skin ointment to make a 7% ointment? Round to one decimal placeand do not include units.
If 4 L of a 30% (w/v) solution is evaporated to a solutionwith 50% (w/v) strength, what will be the new volume (in mL). Roundto the nearest mL and do not include units. mL
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