Question 11
It is recommended to use 30 % solution of isopropyl alcohol to kill bacteria or viruses. A 30 g bottle was filled with enough 30 % solution until its mass was 330 g. How much alcohol is in the bottle?
Safety/editorial note: the first sentence is a historical source claim, not disinfection advice. Use 30% by mass for the arithmetic.
Safety/editorial note: the first sentence is a historical source claim, not disinfection advice. Use 30% by mass for the arithmetic.