The answer is Al which is option B
Answer: The change in internal energy of the gas is +408 J
Explanation:
According to first law of thermodynamics:
![\Delta E=q+w](https://tex.z-dn.net/?f=%5CDelta%20E%3Dq%2Bw)
=Change in internal energy
q = heat absorbed or released
w = work done or by the system
w = work done on the system=
As volume is constant ,
= 0 and w = 0.
q = +408J {Heat absorbed by the system is positive}
![\Delta E=+408J+(0J)=+408J](https://tex.z-dn.net/?f=%5CDelta%20E%3D%2B408J%2B%280J%29%3D%2B408J)
Thus the change in internal energy of the gas is +408 J
<span>((P1V1/T1)=(P2V2/T2))</span>
Answer:
Mass = 100.8 g
Explanation:
Given data:
Mass of sulfur formed = ?
Mass of water formed = 37.4 g
Solution:
Chemical equation:
2H₂S + SO₂ → 3S + 2H₂O
Number of moles of water:
Number of moles = mass/molar mass
Number of moles = 37.4 g/ 18 g/mol
Number of moles = 2.1 mol
Now we will compare the moles of water and sulfur.
H₂O : S
2 : 3
2.1 : 3/2×2.1 = 3.15
Mass of sulfur:
Mass = number of moles × molar mass
Mass = 3.15 mol × 32 g/mol
Mass = 100.8 g
Taking into account the definition of avogadro's number, 3.37×10⁻⁷ moles of methane are 20.32×10¹⁶ molecules.
First of all, you have to know that Avogadro's number indicates the number of particles of a substance (usually atoms or molecules) that are in a mole.
Its value is 6.023×10²³ particles per mole and it applies to any substance.
Then you can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of methane, then 20.32×10¹⁶ molecules are contained in how many moles of methane?
amount of moles of methane= (20.32×10¹⁶ molecules × 1 mole)÷ 6.023×10²³ atoms
Solving:
<u><em>amount of moles of methane= 3.37×10⁻⁷ moles</em></u>
Finally, 3.37×10⁻⁷ moles of methane are 20.32×10¹⁶ molecules.
Learn more about Avogadro's Number: