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scZoUnD [109]
3 years ago
14

An aspirin tablet weighing 0.400 g has been analyzed and contains 68.2% acetylsalicylic acid (ASA) (180.16 g/mol) by mass. A stu

dent dissolved the tablet in hot NaOH and the cooled solution was diluted with deionized water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of the solution was pipetted into a 100 mL volumetric flask and diluted to the mark with FeCl3 solution. Calculate the concentration of ASA in the diluted solution.
Chemistry
1 answer:
bogdanovich [222]3 years ago
4 0

Answer:

0.00018M

Explanation:

Mass of the aspirin tablet =0.4g.

% by mass of ASA=68.2

mass of in the tablet=68.2/100×0.4g

=0.2748g

mass conc of ASA=mass of ASA/Volume of diluent(250ml)

=0.2748/0.25

=1.0992g/dm3

molar conc=mass conc/molar mass

=1.0992/180.16

=0.006M

Conc of the stock solution C1=0.006M

Initial volume for making the diluted solution(V1)=3ml

final volume of the diluted solution=100ml

from dilution principle

no of mole=conc × volume

initial conc(C1)×initial volume(V1)=final conc(C2)×final volume(V2)

C2=0.006M×3ml/100ml

=0.00018M

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3 years ago
Explain how you can use boyle's law to determine the new volume of gas when its pressure is increased from 270 kPa to 540 kPa? T
LUCKY_DIMON [66]
There are several information's already given in the question. Based on the information's the answer can be easily deduced. 

We know the formula

<span>P1*V1/T1 = P2*V2/T2
</span>
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7 0
4 years ago
11.
vagabundo [1.1K]

Answer:

1.22 × 10^22 H atoms

Explanation:

From this question, TNT has the chemical formula: C-H5N306. The number of nitrogen atoms in the TNT substance is said to be 7.30 × 10^21 atoms.

The number of hydrogen atoms in the same TNT substance can be got using mole ratio. Based on the chemical formula, the mole ratio of hydrogen to nitrogen is 5:3 i.e. H5N3.

This means that;

Number of atoms of hydrogen = 5/3 of the number of atoms of nitrogen.

Hence, number of H atoms = 5/3 × 7.30 × 10^21

number of H atoms = (7.30 × 5/3) × 10^21

number of H atoms = (36.5/3) × 10^21

number of H atoms = 12.1666 × 10^21

number of H atoms = 1.2166 × 10^22 atoms.

Approximately, number of H atoms in TNT is 1.22 × 10^22 atoms.

8 0
3 years ago
What is the molarity of ammonia if it is 1.0 ionized?
alexandr402 [8]

Answer:

A (0.0018 M

Explanation:

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