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3 years ago

Which is the most likely reason why an aerosol can explodes when it is thrown into a fire

Chemistry

2 answers:

Lisa [10]3 years ago

5 0

Heat causes the gas particles in the can to move faster and farther apart.

WARRIOR [948]3 years ago

3 0

Aerosol is highly inflammable, That's why.

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You weighed out 0.020 g of your crude aspirin product in order to determine the amount of salicylic acid impurity. Following the

Kitty [74]

Answer:

The correct answer is 7.8 percent.

Explanation:

As mentioned in the given question, the absorbance (A) of the sample solution is 1.07. To find the concentration of aspirin, Beer's law is used, that is, A = ebc

Here, e is the extinction coefficient, which is equal to 139.322 M^-1cm^-1 as per the standard value for salicylic acid, b is the pathlength, which is equivalent to 1 cm. Now putting the values we get,

A = ebc

c = A / (eb)

c = 1.07 / (139.322 × 1)

c = 0.00768 M

Now to determine the percent salicylic acid in the sample, there is a need to compare the value of concentration determined with the concentration of aspirin given initially.

0.02 grams is the initial concentration of aspirin mentioned in the question. The molar mass of aspirin is 240 g/mol.

Therefore, the moles of aspirin will be,

0.02 / 240 = 8.33 × 10^-5 moles

The final volume of the diluted solution given is 10 ml or 0.01 liters.

The molarity of aspirin in the diluted solution will be,

c1 = 8.33 × 10^-5 / 0.01 = 8.33 × 10^-3 M or 0.00833 M

Now, the percent of salicylic acid in the product will be,

c1 - c / c1 × 100

(0.00833 - 0.00768) / 0.00833 × 100 = 7.8 %

5 0

3 years ago

Describe how is the atomic mass of an atom is calculated. URGENT, NEED TO KNOW NOW!!!

padilas [110]

If it's your first encounter with chemistry, your instructor will want you to learn how to use the periodic table to find the atomic mass (atomic weight) of an element. This number usually is given below an element's symbol. Look for the decimal number, which is a weighted average of the atomic masses of all the natural isotopes of an element.

8 0

3 years ago

why are the theoretical density values of brass, bronze, and steel reported as a range of densities? how can you categorize thes

Julli [10]

Answer:

Theoretical density values

brass- $8.4-8.73 gm/cm^3$

bronze- $8.73 g/cm^3$

steel- $7.75 - 8.05 gm/cm^3$

Explanation:

All of these substances are alloys (a substance made from melting two or more substances, one of them usually being a metal). Brass is a combination of copper and zinc, bronze is mostly copper, tin and other non-metals as well and steel is majorly made up of iron and copper. These alloys have various uses and varying importance in different kinds of industries.

6 0

3 years ago

What kind of intermolecular forces act between a hydrogen cyanide molecule and a chloromethane molecule? note: if there is more

solmaris [256]

London dispersion forces, dipole forces

3 0

3 years ago

IgorC [24]

Answer:

Mass of NaF in 250 g tube of toothpaste = 100 mg of NaF

Explanation:

Mass of fluoride per gram of toothpaste = 1 mg

From the given data, the fluoride compound that is most often used in toothpaste is sodium fluoride, NaF, which is 45% fluoride by mass, mass of sodium fluoride per gram of toothpaste can be determined as follows:

1 mg of fluoride per gram of toothpaste = 45% total mass of NaF per gram of toothpaste

100% mass of NaF in toothpaste = 100/45 * 1 mg = 2.22 mg of NaF.

Therefore, mass of NaF per gram of toothpaste is 2.22 mg.

The mass of NaF in 250 g of toothpaste is then calculated below:

In 250 g of toothpaste, mass of NaF = 250 * 2.22 mg = 99.9 mg of NaF

6 0

3 years ago