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ss7ja [257]
3 years ago
8

A sunscreen preparation contains 2.40 % by mass benzyl salicylate. If a tube contains 3.0 oz of sunscreen, how many kilograms of

benzyl salicylate are needed to manufacture 425 tubes of sunscreen?
Mathematics
1 answer:
belka [17]3 years ago
8 0
You need to know that:

1 ounce = 28.35 grams

So, 1 tube contains

3.0 oz × 28.35 = 85.05g total mass

Mass of Benzyl salicylate =

2.40/100 = Percentage of Benzyl salicylate (in numerical value)

= 0.024

0.024 × 84 = Mass of Benzyl Salicylate

=2.016g

If one tube contains

2.016g × 425 tubes

=856.8g

Then,

Converting into kg by (dividing by 1000)

=856.8 ÷ 1000

= 0.8568 grams

= 0.857g (3sf)
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