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motikmotik
3 years ago
11

A solution of cough syrup contains 5.00% active ingredient by volume. if the total volume of the bottle is 51.0 ml , how many mi

lliliters of active ingredient are in the bottle?
Chemistry
1 answer:
amm18123 years ago
3 0
<span>The total volume of the bottle is 51.0ml and the active ingredient is 5.00% by volume then multipy 0.05 x 51.0 = 2.55 ml of active ingredient. Being 5% by volume means that of the total 51.0 ml, 5% of it is active ingredient and the balance is inactive or may even be water. </span>
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3 years ago
In a coffee-cup calorimeter, 1.60 g of NH4NO3 was mixed with 75.0 g of water at an initial temperature of 25.008C. After dissolu
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Answer:

Explanation:

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A helium balloon contains 16.9 L of helium at STP. How many atoms of helium are in the balloon
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Answer : The mass of PbI_2 precipitate produced will be, 9.681 grams.

Explanation : Given,

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Volume of solution = 0.2 L

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First we have to calculate the moles of NaI.

\text{Moles of }NaI=\text{Molarity of }NaI\times \text{Volume of solution}=0.210M\times 0.2L=0.042moles

Now we have to calculate the moles of PbI_2.

The balanced chemical reaction is,

Pb(ClO_3)_2(aq)+2NaI(aq)\rightarrow PbI_2(s)+2NaClO_3(aq)

From the balanced reaction we conclude that

As, 2 moles of NaI react to give 1 mole of PbI_2

So, 0.042 moles of NaI react to give \frac{0.042}{2}=0.021 moles of PbI_2

Now we have to calculate the mass of PbI_2.

\text{Mass of }PbI_2=\text{Moles of }PbI_2\times \text{Molar mass of }PbI_2

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6 0
4 years ago
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