Answer:
Alcohol has greater value of temperature coefficient of expansion than mercury.
Answer:
Concave Lenses Are for the Nearsighted, Convex for the Farsighted. Concave lenses are used in eyeglasses that correct nearsightedness.
Explanation:
Answer:
4Al2O3 + 9Fe --> 3Fe3O4 + 8Al
Explanation:
Al:8 Al:8
O:12 O:12
Fe:9 Fe:9
just make sure that both sides have the same ammount. I started with Iron, balenced it to 3, then made sure i had 12 oxygen on both sides, being that i had 3 iron on the left and 9 on the right so i went back and fixed that. I then saw that i had 8 Al on the left and 1 on the right so i balenced that
Answer:
V = 16.3 L
Explanation:
Given data:
Volume of oxygen needed = ?
Temperature = standard = 273 K
Pressure = standard = 1 atm
Volume of sulfur trioxide = 32.6 L
Solution:
Chemical equation:
2SO₂ + O₂ → 2SO₃
Number of moles of SO₃:
PV = nRT
1 atm × 32.6 L = n×0.0821 atm.L/mol.K ×273 K
32.6 atm.L =n× 22.41 atm.L/mol
n = 32.6 atm.L / 22.41 atm.L/mol
n = 1.45 mol
now we will compare the moles of oxygen with sulfur trioxide.
SO₃ : O₂
2 : 1
1.45 : 1/2×1.45 = 0.725 mol
Volume of oxygen:
PV = nRT
1 atm × V = 0.725 mol×0.0821 atm.L/mol.K ×273 K
V = 16.25 atm.L /1 atm
V = 16.3 L
Answer:
a)
The electro-chemical cell is non spontaneous because is negative
b)
The electro-chemical cell is spontaneous because is positive
Explanation:
a)
Electron change, n = 2
The electro-chemical cell is non spontaneous because is negative
b)
Electron change, n = 2
The electro-chemical cell is spontaneous because is positive