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29 May, 12:20

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.

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Answers (1)
  1. 29 May, 12:48
    0
    24 g

    Step-by-step explanation:

    We first find the mass of 24 % alcohol in 400 g of hand sanitizer. Let x be the mass of alcohol. So, x/400 * 100 % = 24 %

    x/400 = 0.24

    x = 0.24 * 400

    = 96 g

    The mass of the other chemicals is thus 400 g - 96 g = 304 g

    We now find the mass of 30 % alcohol in 400 g of hand sanitizer. Let y be the mass of alcohol. So, y/400 * 100 % = 30 %

    y/400 = 0.30

    y = 0.30 * 400

    = 120 g

    The mass of the other chemicals is thus 400 g - 120 g = 280 g

    The mass of other chemicals that needs to be evaporated is thus 304 g - 280 g = 24 g
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