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The given question is incomplete. The complete question is as follows.
From the following formula, calculate the quantities required for each of the following ingredients to make 5 lb. (avoir) of hydrophilic ointment. All values to be in g, do not include units in your submitted answer; use no more than 3 decimal places. Convert using 1 lb = 454 g. Note: all values done by mass, including the water, so this is not a q.s situation (volume is irrelevant).
Methylparaben 0.25 g
Propylparaben 0.15 g
Sodium Lauryl Sulfate 10 g
Propylene Glycol 120 g
Stearyl Alcohol 240 g
White Petrolatum 250 g
Purified Water, to make 1000 g
Explanation:
For the given quantities, the sum is 620.4 g. Now, amount of purified water (to make 1000 g of ointment) is as follows.
1000 g - 620.4 g
= 379.6 g
Now, to make 5 lb we will calculate the quantities as follows.
Formula weight = 1000 g
Therefore, desired quantity is as follows.
5 lb = 5 x 454 g
= 2270 g
Hence, this means the factor is calculated as follows.
= 2.27
Now, we will calculate the quantity of each ingredient using factor 2.27 as follows.
- Methylparaben = 0.25 g x 2.27 = 0.5675 g
- Propylparaben = 0.15 g x 2.27 = 0.3405 g
- Sodium Lauryl Sulfate = 10 g x 2.27 = 22.7 g
- Propylene Glycol = 120 g x 2.27 = 272.4 g
- Stearyl Alcohol = 240 g x 2.27 = 544.8 g
- White Petrolatum = 250 g x 2.27 = 567.5 g
- Purified Water = 379.6 g x 2.27 = 861.692 g
Answer: Option (d) is the correct answer.
Explanation:
According to law of conservation of mass, the mass of reactants equal to the mass of products.
Therefore, when liquid 1 and liquid 2 reacts then their respective mass will be equal to the mass of products.
In a chemical equation, reactants are written of the left hand side whereas products are written on the right hand side.
Hence, we can conclude that following equation supports law of conservation of mass.