Answer:
Explanation:
Hello!
In this case, since one mole of ethanol release 8,842 J per 1 mole of ethanol, we can write:
Thus, since we need the energy released by 982.6 g of ethanol, we compute the moles in such mass of fuel:
Therefore, the result is:
Which in kJ is:
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Answer:
<u>The amount of energy required to increase temperature 275°C to 385°C is ΔQ =3.95208kJ</u>
Explanation:
Given :
- <em>The mass of the water vapour is 18 g</em>
- <em>The initial temperature : 275°C</em>
- <em>The final temperature : 385°C</em>
According to the formula :
Δ
Δ
Where ,
- <em>Δ
is the heat supplied</em> - <em>
is the mass of the substance (water vapour) = 18g</em> - <em>
is the specific heat of the substance ( water vapour) = 
</em> - <em>Δ is the change in temperature =
</em>
∴
ΔQ = 
⇒ΔQ =3.95208kJ
Answer:
A) False
B) True
Explanation:
The question is incomplete. The complete question is as follows.
There are two statements. Identify which statement is true or false.
A) For any substance, solid, liquid or gas, mass increases as volume increases.
B) Density represents mass per volume.
Statement A
- Mass is defined as the amount of matter in an object. Its fixed and can't be changed.
- Volume on the other hand is the amount of space an object takes up.
Since the amount of matter is fixed, an increase in volume doesn't cause an increase in mass. For example, a test tube, with a volume of 10ml, contains liquid fragrance. When heated, the fragrance vaporizes and fill the entire room, until you can smell it in every corner. Note that previously the fragrance of same mass was occupying a 10ml space in the test-tube. After heating, the same mass of fragrance occupied the entire room (volume increased but mass remained constant).
It happened because as the fragrance is heated, the space between molecules increases causing them to occupy more space BUT in the whole scenarios, the number of molecules stayed unaffected. <u>Hence statement A is false.
</u>
Statement B
Density measures the compactness of the substance. It's defined as the amount of mass per unit volume. It increases as the atoms/molecules in a substance comes closer. Density of solids are greatest as the atoms/molecules are tightly packed together. It is least in gases as the molecules are far apart from each other. <u>Hence the statement is true.
</u>
Answer:
Since valence shells are mostly empty in nonmetal atoms, the atoms attract and hold any electrons they can in order to fill their valence shells.
Answer:
1.52
Explanation:
speed of light through clear rock salt = speed of light in air (vacuum)/index of refraction
index of refraction of clear rock salt = speed of light in air (vacuum) / speed of light through clear rock salt
index of refraction of clear rock salt= 3.00 x 10^8 m/s / 1.98 × 10^8 m/s
index of refraction of clear rock salt= 3.00 x 10^8/1.98 × 10^8 ( the × 10^8 cancels out)
index of refraction of clear rock salt= 3.00/1.98
index of refraction of clear rock salt= 1.52
