Answer:
ΔE = -2661 KJ/mole
ΔH = -2658 KJ/mole
Explanation:
ΔH = q - PΔV
ΔE = q + w
<u>First, to find ΔE:</u>
The reaction PRODUCES 2658 kJ of h (q), and does 3 kJ of work (w).
2658 kJ(q) + 3 kJ(w) = 2661 kJ, BUT the reaction <u><em>PRODUCES</em></u> heat, which means ΔE is negative.
ΔE = -2661 KJ/mole
<u>Second, to find ΔH:</u>
ΔH = q - PΔV
ΔH = 2658 kJ(q) - PΔV
Now, the question states that butane burns at a constant pressure; that just translates to the pressure of the reaction is equal to 0.
ΔH = 2658 KJ(q) - (0)ΔV
ΔH = 2658 KJ - 0
ΔH = 2658 kJ, BUT, like before, the reaction PRODUCES heat, which also mean ΔH is negative.
ΔH = -2658 KJ/mole
I hope this helped! Have a nice week.
Answer:
true
Explanation:
from Newton's second law of motion ,we can understand that acceleration of a body is directly proportional to the force applied on it and inversely proportional to its mass ,so as the force applied increase,the acceleration also increases
Burning and other changes in matter do not destroy matter. The mass of matter is always the same before and after the changes occur. The law of conservation of mass states that matter cannot be created or destroyed
The Sun appears bigger and brighter because it is much closer to Earth.
Explanation:
Stars are the celestial objects, formed by collection of luminous body which is spherical in nature. Stars are formed by its own gravity.
Sun is also a star which is bigger in nature. Sun is present at the center of the solar system around which the planets revolve. sun is the main source of light and heat for all the planets revolving around it during day times.
There are also some stars which are bigger and brighter than sun but due to its presence in the solar system at the central position makes it closer to the earth. Therefore this is the main reason sun is bigger and brighter as it is much closer to Earth.
Answer:
0.06457g of H₂
Explanation:
2Al(s) + 6H₂O(l) + 2KOH(aq) → 2K[Al(OH)₄](aq) + 3H₂(g)
Based on the equation 2 moles of Al produce 3 moles of hydrogen.
First, we need to convert mass of Al to moles and then with the chemical equation find moles and mass of hydrogen:
<em>Moles Al (Molar mass: 26.982g/mol):</em>
1.15g Al * (1mol / 26.982g) = 0.04262 moles Al
<em>Moles H₂:</em>
0.04262 moles Al * (3 moles H₂ / 2 mol Al) = 0.06393 moles H₂
<em>Mass hydrogen (Molar mass: 1.01g/mol):</em>
0.06393 moles H₂ * (1.01g/mol) =
<h3>0.06457g of H₂</h3>
