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mario62 [17]
2 years ago
11

A graduated cylinder is filled to

Chemistry
1 answer:
vovikov84 [41]2 years ago
3 0

The volume of the tin piece in cubic centimeters is 4,3 cm³

When adding an object to a liquid, the displayed volume difference corresponds to the volume of the added object.

In this way, to find the value of the object's volume, subtract the<em> initial volume</em> from the <em>final volume</em>:

                                       16.8ml - 12.5ml = 4.3ml

To convert to cubic centimeters, the conversion scale of volume and length measurements need to be used, finding that mL is equal to cubic centimeters. So, the final answer is:

                                                        4.3 cm³

Learn more about units conversion and volume: brainly.com/question/23073693

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Which of these is reasonable for most of the damage caused by a tornado
pshichka [43]

the answer is wind, hope i helped

3 0
4 years ago
Read 2 more answers
A gas of unknown molecular mass was allowed to effuse through a small opening under constant-pressure conditions. It required 10
Shtirlitz [24]

Answer:

The molar mass of the unknown gas is 392 g/mole

Explanation:

Firstly we write out the parameters

Volume of the gas X that effuse for 105 s = 1.0 L

Volume of the O₂ gas  that effuse for 30 s = 1.0 L

Molar mass of O₂ = 32 g/mole

Rate of effusion of the gas X = 1.0 L/105 s = 0.0095 L/s

Rate of effusion of O₂ gas = 1.0 L/30 s = 0.033 L/s

Graham's law of effusion states that

\frac{Rate A}{Rate B} = \sqrt{\frac{Molar mass B}{Molar mass A} }

Therefore we have

\frac{0.0095 L/s}{0.033 L/s}  =\sqrt{\frac{32 g/mole}{Molar mass of X} } or Molar mass of X =  \frac{32}{0.0816} g/mole = 391.99 g/mole

The molar mass of the unknown gas is 391.99 g/mole ≈ 392 g/mole

8 0
3 years ago
A student wants to measure the entropy of ice. What should the student do?
Helen [10]

Answer: Option (c) is the correct answer.

Explanation:

Entropy is defined as the degree of randomness. This means that more is the number of collisions taking place between atoms of a substance more will be the randomness.

Therefore, more will be the entropy of substance. We cannot measure the entropy but we can measure the change in entropy of a substance.

A thermometer is a glass tube that contains a liquid column generally mercury, and it is usually used to measure the temperature of human body.

A calorimeter is a device or apparatus that is used in a chemical reaction to measure the amount of heat involved.

Therefore, we can conclude that the student can't measure entropy directly, only an entropy change.

 

6 0
3 years ago
The concentration of Fe2 in a sample is determined by measuring the absorbance of its complex with ferroxine. The sample, measur
sdas [7]

Answer:

  • Absorbance of sample solution = 1.21
  • Absorbance of reagent blank = 0.205

Explanation:

In order to solve this problem we need to keep in mind the <em>Lambert-Beer law</em>, which states:

  • A = ε*b*C

Where ε is the molar absorption coefficient, b is the length of the cuvette, and C is the concentration.

By looking at the equation above we can see that if ε and C are constant; and b is 5 times higher (5.00 cm vs 1.00 cm) then the absorbance will be 5 times higher as well:

  • Absorbance of sample solution = 0.242 * 5 = 1.21
  • Absorbance of reagent blank = 0.041 * 5 = 0.205
8 0
3 years ago
Which reaction can be used to calculate the enthalpy of formation of a substance
Zielflug [23.3K]

ANSWER

option B

EXPLANATION

Firstly, we will need to define the standard heat of formation

The standard heat of formation is the amount of heat evolved or absorbed when one mole of a compound is completely formed from its constituent elements under standard conditions.

From the options provided, you will see that only option B aligns with the definition of the standard heat of formation.

\text{ H}_{2(g)}+\text{ }\frac{1}{2}O_2\rightarrow\text{ H}_2O(l)

From the above reaction, you will see that 1 mole of water is formed from hydrogen and oxygen.

Hence, the answer is option B

4 0
1 year ago
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