Question

How much of other chemicals must be evaporated from 400 grams of a hand sanitizer that is 24% alcohol to strengthen it to a hand sanitizer that is 30% alcohol? Correct your answer to the nearest whole number. ​

Answer 1

Answer:

80 grams

Step-by-step explanation:

Weight of 24% solution = 400 grams

Alcohol content= 24%

Amount of alcohol= 400*0.24= 96 grams

Weight of 30% solution with same amount of alcohol:

• 96/0.3= 320 grams

The difference in weights is the other chemicals evaporated:

• 400-320=80 grams

Answer 2

Answer:

Step-by-step explanation:

Dude, 80 g must be evaporated...

now, we see that 24% is alcohol.....

=>   $\frac{24}{100}$ x 400 = 96g of alcohol is present

in order to increase the concentration from 24% to 30%, let the amount of other chemicals to  be vaporized be 'p'

now, $\frac{30}{100}$ x (400-p) = 96g (96 still remains, since other products must be evaporated in order to increase the concentration)

=> 400-p = $\frac{96x10}{3}$

=> 400-p = 320

=> p = 400-320

=> p = 80g

additional information=> hand sanitizers must contain atleast 70% of isopropyl alcohol (CH₃CHOHCH₃)

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